All clothing falls into this diagram somewhere....
Functional clothing being either everyday wear or clothing designed for a specific purpose. For instance 6 pocket pants were originally designed by the military to give soldiers a little extra and handy place to carry things like magazines and grenades.
Fashionable clothing is clothing designed to be discarded after a year or two. It may or may not be practible and it may or may not be sexy. But it almost always has a limited shelf life and is at the whim of public opinion.
Pleasurable clothing is clothing designed to either make you look sexy or feel sexy.
So things like military 6 pocket pants merge with fashionable multi pocket pants in silk to emerge in the overlapping section as Cargo Pants at your local WalMart.