V.S.
Hi Joy,
Sine he likes the feel of his shirt, try giving him a wash cloth to chew on. This is what I always used with my daughter when she was teething. When she was a baby I would wet one end of the wash cloth, twist it, and then freeze it. The cold really helps the gums and since I only wet the one end, her hands wouldn't get cold like most teethers you freeze. Hope this help!
V.