I think what is inappropriate would be any clothing that shows body parts covered by a one piece bathing suit (which I love wearing). I don't wear tube tops either because they fall off and are thus immodest. Also, no shorts/skirts that if you wore it with a t-shirt and pulled it up to where medium rise jeans rest and you can't tell you're wearing it underneath. That is, unless it's to sleep in.
And usually when I'm shopping with my mom, she doesn't let me buy short shorts, but I'm okay with them as long as long as they are below the upper thigh because at least you couldn't see your underpants if you looked closely enough.