Relaxed women’s fit with dropped shoulders and a soft silhouette. 

I've estimated UK women's sizes but, to be sure, please lay one of your favourite sweatshirts flat and measure in cm as follows:

A - chest (armpit to armpit)
B - length (neck to hem)

Size Approx UK Size A  B
XS 6-8 57 54
S 8-10 60 57
M 12-14 63 59
L 16-18 66 61
XL 18-20 69 63
XXL 20-22 73 65