Additionally, most costumes except for those of Dobu dance are made for adult men or women: they are heavy, the eyesight is limited when wearing a mask, the difficulty level in choreography such as handling the long part of the costume (hem, ancient skirt, etc.) is high; however, the traditional groups in East Japan have mostly adult members and cannot afford, so the development of children's participation is not active enough; even when developing them, it is limited to Kangen music or "Urayasu-no-mai Dance" for which reasonable costumes can be used in an informal style, and in most cases Bugaku is not performed or is limited to adults.
又、童舞以外の殆どの装束は成人男性、又は女性用に仕立てられ、又、重量があること、仮面を付けた場合に視野が制約されること、長く伸びてる部分（裾、裳、等）があるため、振り付けに関しても伸びてる部分の捌き方等の難易度が高いこと、又、東日本においては伝承団体のメンバーの殆どが成人であることと財政に余裕がない場合が多いことから少年少女の育成に消極的な場合が多く、育成してる場合でも略式なら安価な装束で済む管弦と『浦安の舞』等にとどまり、舞楽は行わないか、行う場合でも成人に限られる場合が多い。