I really want my best friend as one of my maids of honor the other being my older sister. I am having a problem picking a dress that both would look good in. I would prefer they wear the same dress or similar to distinguish them from my bridesmaids. My sister is slim, athletic build and anything looks good on her, however my best friend is plus size. I've picked out some dresses that would be flattering on both my sis and my best friend and surprisingly they each like them. However my friend is still self conscious about her arms. What should I do?