Hey all, I want to purchase the classic dy bracelet but am trying to decide between the 5mm and the 7mm. On my 5'4" frame, I have freakishly thin arms - for visuals, i can fit a LV speedy 25 handle very close to my shoulders. i actually am able to wear children's jewelry. so that being said, would the 7mm be too big? is there a more "classic" or "popular" size. i want to get an idea before i go to the boutique, thanks!