This is Jo. She models all of our size S jumpers. She usually wears a size 10. Her measurements are:

Height: 5'7", Bust: 33", Waist: 27.5", Hips: 36.5", Arm Length: 24"

 

Size UK/US Bust
Extra Small UK 6 / US 2 up to 32"
Small UK 8-10 / US 4-6 34"-36"
Medium UK 12-14 / US 8-10 38"-40"
Large UK 16-18 / US 12-14 42"-44"
Extra Large UK 20+ / US 18+ 44"+