I think I've just taken usability to whole new heights... ^^
Check out these mix and match tanks, they come in two versions, long, plain ones and short printed ones. Each pack has one tank of each in all layers plus a version with both tanks in one already, giving you at least three different ways of wearing them. The fatpack has.. well.. all of them.. giving you... um... I do suck at math, but a crapload of combination possibilitys!
Pick the up at the A:S:S mainstore