Cycling Jerseys are made to fit snug. For Clydes like me, this can be a problem.

Bontrager Solstice Jersey seems to be a more relaxed fit than some, which is a good thing for me. It is one of the only cycling jerseys where an XL actually fits like an XL. For comparison sake, my Bontrager in size XL actually fits a little looser than a Pearl Izumi in size XXL. If you wear a size Medium T Shirt, you might actually be able to get into a Medium in a Solstice Jersey. Quality is decent. I have been using mine now for two full riding seasons, and I use them through the fall with a wool or synthetic long sleeve base layer underneath and a windbreaker over.

Bontrager Solstice Short Sleeve Jersey - Trek Bicycle Superstore