Shirt Donation?

If you don't know already I am in the Navy stationed in Newport RI. Two times every year the Surface Navy Association puts on a "5K by the Bay" race and gives out t-shirts. The last couple races they have had an abundance of extras left over.
Recently I have seen a lot of articles about people collecting shoes and finishers medals to donate for one cause or another. I have about 2-300 t-shirts that I can give away (long and shot sleeve) and was wondering if anyone knew of a group, other than the salvation army, that takes shirts to give away?
All suggestions appreciated.

Thanks,
Scott