I remember reading in the past that people had trouble ordering the correct size of the Champion brand runDisney shirts (specifically people complained that they ran small), so maybe it's better this way...you can see them in person and try them on.
Yup, I'd noticed that in the reviews (on disneystore and on champion's own website) and was going to order a medium, which sold out first. I was hoping they would have restocked, instead, they just sold out of everything! I'll cross my fingers that they have it at the expo. My sweetiepie took a personal day from work so that we could fly down early together on Friday (instead of me in the afternoon with him following in the late evening), so hopefully I'll have a decent amount of time at the expo and will be able to get one.