i am 27 and the younger sister of the bridesmaid. it is a summer evening wedding rustic vineyard style in a nice location. it is not formal black tie and not a casual summer outdoor wedding either. i bought this dress http://www.lyst.com/clothing/pisarro-nights-beaded-split-sleeve-silk-shift-dress-mocha-7/ and it is pretty but then i read it is tacky to wear a beaded dress if it is not a black tie wedding. and being a younger sister and not a close friend or family member i think it might be too dressed up and look like i want attention but even though it has beading it is a mocha color, kind of loose, knee length and has sleeves which make it seem a little more casual that a tight, strappy, full length, sparkly gown. if i wear this i'm not going to accessorize except for everyday white gold ball stud earrings. the second dress is this one http://www.ebay.com/itm/321413603262?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649 but i am worried it might look too casual like career dress because it is grey, loose, and sleeved. i would dress it up with a statement necklace and maybe a embellished belt if the wrap tie isn't attached and a heel. please help me pick which dress is more respectful, appropriate (not the prettier dress necessarily). i don't want to look over dressed or under dressed. i feel the first is a little over dressed and the 2nd is a little under dressed. please help me pick the 1st dress, 2nd dress, or if i should keep looking.