Ehhhhhh, just for scientific purposes, we need an underwear girl. A pair of supernatural underwear a guy wears that never needs to be cleaned *wink wink* and transforms into a bodacious babe when he takes them off *wink wink*.
There is already a Japanese Anime about a blanket (scarf?) that turns into a girl. And the dude goes and fights his enemies with the special attack skills that his blanket has. It was horrible.
At the current pace, we'll get mind melting manhua within the decade. Through hentai technology transfer China is able to rival levels only previously seen in Japan.