fig1 and 2 show an architectural opening 20 in the form of a window having a semi - circular configuration so that the window has a semi - circular or arcuate top edge 22 . conventional framework 24 extends around the window opening which is typically wood so as to form a support base for the system of the present invention . the system of the present invention includes a window shade material 26 that is suspended vertically in the architectural opening adjacent to a glass panel 27 through use of support brackets 28 anchored to the framework 24 along the upper edge of the architectural opening . in the embodiment of the present invention illustrated in fig1 - 7 , a support channel 30 is also used to facilitate the attachment of the shade material to the support brackets . while the bottom edge 32 of the shade material 26 can be secured to the sill of the architectural opening , a weighted bottom rail 34 might also be included as shown best in fig3 so as to retain the shade material , through gravity , in a desired fully - extended condition across the opening . the shade material 26 could assume numerous forms . modifications to the suspension system to be described hereafter in detail could be made accordingly . such modifications are felt to be fully within the knowledge of those skilled in the art . for purposes of the present disclosure , the shade material is illustrated as a cellular shade material having a pair of vertically extending sheets 36 of material which are interconnected with a plurality of vertically spaced horizontally extending vanes 38 of generally s - shaped transverse cross - section . such a shade material is known in the art and has been primarily designed to be retractable between the extended position shown in fig1 - 3 and a retracted position ( not illustrated ) wherein the shade material is wrapped around a roller in a headrail along the top edge of the shade material . the sheets 36 , which are preferably sheer , are typically also movable with the roller so as to be shifted in opposite vertical directions thereby causing the vanes 38 to move between the open position illustrated in fig3 and a closed position ( not shown ) wherein the vanes lie substantially in a flat vertical plane between the sheets of material . in the present invention , however , the shade material 26 merely remains suspended in the fully extended position with the vanes open as shown in fig3 so as to define gaps 40 therebetween . with the system for suspending the shade material disclosed in the present invention , the shade material conforms to the shape of the architectural opening , for example , in the embodiment of fig1 and 2 , a semi - circular configuration . in order to suspend the shade material 26 in accordance with the present invention , the sheets 36 in the shade material are extended above the uppermost vane 38 and the top edges 42 of the sheets are cut to conform with the configuration of the framework 24 around the top of the architectural opening . in fact , the entire shade material is cut so that in its fully - extended position of fig1 - 3 , the top edge of the shade material conforms with the top of the framework in the architectural opening . the upwardly opening support channel 30 is positioned between the sheets 36 of the shade material and above the uppermost vane 38 in the shade material so that the sheets extend along arcuate side walls 46 of the support channel . the outer surfaces of the sidewalls along the arcuate upper edges thereof are provided with strips 48 of adhesive to which the sheets of the shade material are secured . in this manner , the sheets overlie the side walls of the support channel so that the sheets are continuous across the entire semi - circular architectural opening . the support brackets 28 are utilized to suspend the support channel 30 and the shade material 26 from the framework 24 at the top of the architectural opening and any number of support brackets can be utilized typically dependent upon the size of the opening . in the disclosed embodiment , two such support brackets , which are identical , are utilized . the support brackets 28 are seen best in fig4 - 7 wherein it will be appreciated each support bracket has a generally flat body 50 with an elongated slot 52 therein having an enlarged key hole 54 at one end to facilitate connecting the support bracket to the framework 24 of the architectural opening as will be described hereafter . at each end of the flat body 50 are downturned channels 56 formed from inner 58 and outer 60 spaced legs wherein the inner legs are interconnected by spaced gussets 62 to the flat body . a lower edge of each inner leg 58 has outwardly directed lips 64 that project into the space or channel 56 defined between the inner and outer legs . as best seen in fig7 , to mount the bracket to the framework around the architectural opening , a screw - type fastener 66 is inserted into the undersurface of the framework at a predetermined location and then the head of the fastener is inserted through the keyhole 54 in the slot 52 of the support bracket so that the bracket can be slid relative to the fastener to a desired location . the fastener can then be tightened to retain the support bracket at the desired location . as probably best seen in fig5 and 6 , and as mentioned previously , the support bracket 28 is utilized to suspend the support channel 30 and the shade material 26 within the framework 24 of the architectural opening . the shade material is secured to the support channel as described previously so that the sheets 36 of shade material overlie the outer faces of the side walls 46 of the support channel . reinforcement strips 68 of plastic , rigidified fabric , metal or the like are secured with , for example , adhesive to the inner face of the side walls of the support channels along the top edges of the side walls with the reinforcement strips only being necessary at locations where a support bracket 28 will be interconnected with the support channel . while adhesive 67 is preferably used to connect the reinforcement strip with the support channel , it could be connected in any manner so long as the reinforcement strip establishes a slight laterally inward projection from the side walls of the support channel . to interconnect the support channel 30 and shade material 26 to the support bracket 28 , the top edges of the support channel are inserted into the downwardly opening channels 56 of the support bracket until the reinforcement strips are moved above the lips 64 on the inner legs 58 of the support brackets . the lips then underlie the lower edges of the reinforcement strips and the reinforcement strips with the support channel and shade materials connected thereto are retained on the lips by the outer leg 60 of the support bracket . of course , to remove the support channel from the support bracket , the outer legs are flexed slightly so as to allow the reinforcement strips to be removed from their overlying relationship with the lips . obviously , the support bracket is made of a material that is substantially rigid but has some flexibility and resiliency to permit attachment and removal of the support channel and shade material . it has been found that once the top edge of the shade material 26 has been suspended from the top edge of the framework in the architectural opening with the support brackets 28 as described above and with the lower edge 32 of the shade material being either secured to the window sill or held by gravity in close relationship thereto with a weighted bottom rail 34 , the upper edge of the shade material will lie in closely spaced or contiguous relationship with the framework around the top of the architectural opening so that the shade material custom fits the opening and will remain in the fully extended but open position illustrated and described . a second embodiment of the present invention is illustrated in fig8 - 17 a in an architectural opening 70 of generally rectangular configuration but wherein the top frame member 72 of the opening is at a bias or is inclined relative to the bottom edge or sill 74 of the opening . again , the shade material 76 used in the system is shown as being identical to that of the previously described embodiment but the material is mounted in the opening with an alternative support bracket 78 . in this embodiment of the invention , the top edge 80 of the shade material 76 is cut along a bias or at an incline conforming to the incline of the top frame member of the architectural opening . reinforcement strips 68 are secured as with adhesive 82 along the outer top edge of each of the sheets 84 of shade material 76 so the reinforcement strips project laterally outwardly away from the associated sheet of shade materials . the reinforcement strips are utilized to facilitate attachment of the shade material to any desired number of support brackets 78 mounted on the top frame member of the framework around the architectural opening . the bracket 78 utilized in this embodiment is probably best illustrated in fig1 , 16 a , 17 , and 17 a . the bracket is a two - piece bracket having a mounting base 86 shown in fig1 and 17 a and a main body 88 shown in fig1 and 16 a . the mounting base has a passage 90 through one end thereof adapted to receive a screw - type fastener 92 that can be advanced into the top frame member of the framework around the architectural opening . the mounting base 86 further includes a recess 94 in a top surface thereof to removably receive the main body 88 as will be described hereafter and a protruding lip 96 having a cam surface 98 at the end opposite the passage 90 . the mounting base can be secured to the framework at any desired location and the main body releasably connected thereto as will be described hereafter . the main body 88 has two identical components 100 defining slotted top walls 102 and downturned inner 104 and outer 106 legs at opposite ends of the top surfaces . the outer leg has an inturned lip 108 along its lower edge that protrudes into a space or channel area 110 defined between the inner and outer legs for a purpose to be described hereafter . each component 100 is identical and connected to the other component with a bridge member 112 that is relatively thin and adapted to be slid into overlying relationship with the mounting base 86 when mounting the main body on the mounting base . the bridge member can be advanced against the cam surface 98 on the main body thereby allowing the bridge member to pass or slide over the protruding lip 96 on the mounting base until the bridge member is fully seated within the recess 94 in the mounting base . the main body can be removed from its seated relationship with the mounting base in a reverse manner . the sheets 84 in the shade material 76 along their exposed upper edges to which the reinforcement strips 68 are connected can be inserted into the aligned downwardly opening channels 110 of the identical components 100 of the main body of the bracket so that the main body of the bracket retains the shade material with its sheets spaced as illustrated in fig1 . the lip 108 on the outer legs 106 of the main body of the mounting bracket support the reinforcement strips even though flexing of the outer legs allows the reinforcement strips with the sheets attached thereto to be removed from the main body of the mounting bracket if desired . when suspending the shade material 76 within the architectural opening , the mounting base 86 of the support brackets 78 are first secured to the framework at desired spaced locations along the top frame member 72 and the shade material is secured to the main body 88 of the mounting bracket as described above . finally the main body is slid over the mounting base 86 of the mounting bracket until the bridge member 112 lies within the recess 94 to releasably secure the main body to the mounting base . as seen in fig1 , the shade material 76 is typically mounted on the interior side of a glass panel 112 or the like and within the framework of the architectural opening . the shade material hangs freely within the opening in a fully extended and open position . as with the first - described embodiment of the present invention , the bottom edge of the shade material could be secured to the sill of the architectural opening or connected to a weighted bottom rail 114 that retains the shade material in a fully extended position . although the present invention has been described with a certain degree of particularity , it is understood the disclosure has been made by way of example and changes in detail or structure may be made without departing from the spirit of the invention as defined in the appended claims .