The only things I can add are:

1) To increase the likelihood of a good fit on an internet purchase: If you have a t-shirt that you like the fit of, measure it from armpit to armpit with the t-shirt flat on a table. Compare it to the same measurement that the online vendor should include include with his online listing.

2) If you have a big stomach, consider getting a jersey with no elastic in the waist. They aren't all that common but they are out there.

3) If your choice is between two sizes, the bigger size is usually the best choice.

4) 'Recreational' or 'Loose' cut jerseys fit more like a t-shirt with usually no taper to the waist. 'Club' cut have a small amount of taper to the waist. And race cut have quite a bit of taper and are designed to fit skin tight.

Good luck in your search!

Dan