as we all know, players often change jersey sizes over time. they sometimes change them within a single season. in my experience, an acceptable (ie: likely) range within a single season is +/- 1 size.
+/- 2 sizes is unlikely or unacceptable. i have a spreadsheet with over 1600 jerseys of stars, commons, callups, etc and have yet to find a single player who moved up or down 2 sizes in a single season. i believe +/- 2 sizes over two seasons is entirely plausible, but not within one.

i'd like to get other's opinions on this matter.

what do you feel is an acceptable range within a single season?

rudy.