Medium is much larger than other smartwool's medium - Smartwool Merino Sport 120 Long Sleeve - Women's

As I own different styles of Smartwool's long-sleeve tops and Medium always worked for me, I didn't bother to try this top before washing. By the time I put it on, I could no longer return it. This top is way too big for me. The chest measurement must be about 4 inches larger than the Smartwool 150 tops that I have.