Same problem here! I haven't yet figured out how wear them in a "casual" setting, but here's what I do at work (business casual): I usually wear them untucked over fitted slacks. (This works best if the shirt isn't too long.) I often button them all the way up with a statement necklace on top -- easier than leaving them partly unbuttoned and fiddling with them to make sure both sides of the collar stay even. Over the winter there was a trend to wear a buttoned-up cardigan over a shirt left untucked so the tails show underneath...that's what I'm wearing today, in fact! I've also worn white blouses with skirts -- since the skirts hit at my natural waist, I usually tuck the shirt in, or sometimes leave it untucked and wear a belt over top.