Rachel (wearing Mineral) is 5'10", usually wears a US size 2 and wears a size S here.
Jennifer (wearing Black w/ Moss Green Something Borrowed Shirt) is 5'9.5", usually wears a US size 10 and wears a size L here.
Cindy (wearing Moss Green w/ White Made it T-shirt) is 5'10", usually wears a US size 6 and wears a size S here.
Note: Size up for a baggier fit.