Wonderlink Jamie Full Zip Jacket

I purchased size large and found that a large fits good but I typically wear a medium. I would recommend sizing up depending on if you like your clothes to be fitted or want to wear anything heavy underneath. For long sleeve shirts, thin form fitting ones fit fine underneath. I have never tried wearing a sweatshirt or hoodie underneath because it’s not that kind of “jacket” . In my opinion, it’s more similar to a tack suit jacket that is form fitting, I think it would be uncomfortable wearing anything heavy underneath. I feel it would be bunched up and uncomfortable.