I ordered two dresses for wearing around the house and/or beach cover-ups. Similar dresses that I own are tight around my arms so I ordered these in 5X. Even if they were extremely loose I would be OK with them. I was surprised when I tried them on that the arm openings are barely bigger than the 2X or 3X. Buyer beware that dresses are tight around the arm even for a normal size 2X in a 5X!