I'm another who likes the look of boho, but doesn't feel comfortable wearing it myself. For some reason it feels very at odds with the more retro element in my style. I do think, though, that like any trend, anybody can wear boho well, without looking over-the-top or hippyish. It's in the details: wooden jewelry, braided or distressed leather, fringed scarves and gladiators are all little ways of incorporating the look, if the more "obvious" one of volume doesn't float your boat. (Though I also agree with Maya and Angie that almost anyone can wear volume- it's also in the details and the way you wear it!)
There is a chain here in the UK called Jigsaw (I think there are some stores in the US, too?), which has been around since the 70's, and has always had a bit of an underlying boho vibe. Even though I don't consider myself a boho girl, I love Jigsaw's collections. It's a more polished, intellectual version of boho, if that makes any sense.
http://www.jigsaw-online.com/