ASA T-shirt question

[Little Jimmy]

Last year I bought some T-shirts from ASA that say "ASA Umpire" on them (2 whites and 2 blues). Planned on wearing them under the uniform, but honestly they were too good (heavy) for summer and I relegated them to the dresser and kept using regular, thinner T's. I sometimes think about wearing the ASA shirts out around town but wonder if they are "official". In other words I'd never wear the powder blue to a cookout but could I wear the T (provided I did'nt drink too much of course)? Opinions?