Yes, TRY ON EVERYTHING. Don't just hold it up and say, "yeah, that'll fit" (typical "guy" shopping). That's part of the fun, going into the changing room, undressing...dressing...looking at yourself in the mirror (and yes, it's for vanity's sake! You want to look GOOD!) I've had clothes that were all the "same" size, but only one item actually fit; depending on what "it" is, I might take a 10, maybe a 16...no way to tell without trying it on.
Yay for shopping!!