Being on the fluffy side, I have trouble finding things, also. Shopping on line has been a blessing! These two sites tend to ship things within ten days or less and you might find something. Catherine's is better quality, OSP is cheaper but wearable stuff (look at reviews before buying):
http://catherines.lanebryant.com/
http://www.onestopplus.com/clothing/
Good luck and try to enjoy the wedding!