Size way up!
Reviewed by Melissa from Maryland on Thursday, December 10, 2015
I'm a US size 4, bought this in a UK 12/US 10. It fits comfortably over a base layer and snugly over a layering fit fleece (I wear a TNH Radium Hi-Loft for reference). The arm holes are a bit on the tight side with the fleece, wearable, but tight. They're completely fine without the jacket. The bottom of the vest is elasticized (presumably to keep the wind out) and fits nicely. But yeah, size way up.