Hems of different depths (which includes the seam allowance) may have a particular style to achieve, which requires more or less fabric depending upon the style. A handkerchief-style edge requires a hem allowance of 0.6 cm or a quarter inch. A typical skirt or pant hem may be 5-7.6 cm. The hem's depth affects the way the fabric of the finished fabric will drape. Heavier fabric requires a relatively shorter hem. An interface fabric sewn to the fabric in the hem has a useful function in some hem styles. A bias strip is sometimes used as a hem interface. This adds fullness to the finished garment and reduce wrinkling.