Join Date: Jun 2005
Bikes: 1990 Trek 1500; 2006 Gary Fisher Marlin; 2011 Cannondale Synapse Alloy 105; 2012 Catrike Trail
Are you anywhere near a shop where you can try some on? That can be invaluable. There are places you can get larger jerseys online (aerotechdesigns, love2pedal, etc.), but it can be a crapshoot on fit. Sometimes getting one long enough in the torso will also result in it being baggy. Sometimes not.
FWIW, though, almost all cycling-specific jerseys are cut longer in back.