Bathrobes are categorized by their shape of weave:
Flannel: Flannel is a soft woven fabric, made from loosely spun yarn, usually cotton or wool.
Terry: Terry is a pile fabric, usually woven of cotton, with uncut loops on both sides, used for bath towels and robes. The longer and denser the loops are, the more absorbent the bathrobes are.
Velour: Velour is a fabric with cut loops. Velour bathrobes are typically made with terry inside, as terrycloth absorbs water better than velour. Velour gives the bathrobe luxury, coziness, and makes the garment softer to the touch.
Waffle: Waffle fabric has good water absorbency, is loose and has a distinctive “gridlike” appearance. For the most part, these bathrobes are designed for their lightweight.