Wow, thanks for all of the suggestions! I'm so glad I asked, because I was thinking the opposite of what is being advised. I thought I should be looking for tops that have a cap sleeve or cover part of the shoulder. I guess I thought more coverage would make my arms look slimmer, but from what everyone has posted I realize now that is wrong. I've been terrified of halters because I figured that showing my whole arm would make it look bigger. Ahh, I really need to remember the "illusion factor." Thanks so much everyone! I'm off to let my fingers do the shopping for some new summer tops!