I was torn between 2 sizes too (small & medium), and I went with the small - although I wear medium jerseys. It ended up being a perfect fit. I'd recommend comparing the actual sizing (the numbers, not the S/M/L) with the sizes of other gear that you are happy with.

But Nanci is absolutely right - TE handles returns (and resends) very quickly. Or you could order both sizes and then send one back.

--- Denise