cjh, I hadn't heard of the term "half placket." Thanks for explaining. I think that a half placket gives a shirt a more casual vibe than what I am looking for; I like shirts that button all the way down to the bottom.
bettycrocker, I'll let you know if I find anything. So far, the one button-down shirt I have that is comfortable and drapey is from Anthropologie (it's rayon). Anthro is pricey, but they have SO MANY things in petite sizes now. White House Black Market is pricey too but usually has good-quality stuff.
Windchime, this is actually an old thread, but my need still exists. I will try H&M again; I haven't been in there for several months. The price is always right at H&M! And yes, it's irritating not to have the options that everyone else has, whether you're tall or short.