In these boiling summer days, women started to put on there skirts for beauty and cooling, but one thing leads to another; shorter skirt brings more risk to expose your underpants. Some people will walk sideway or covered it by purse to prevent it, but is it kind of strange to do that? Our application can calculate the appropriate length of skirt for you to wear skirt without worry, even walking up the stairs or sitting across from people. p.s the length is only for your recommend, you still can decide by yourself.