This is Lemmy. Lemmy has an eczema-like skin condition, and so wears little T-shirts to prevent his harness from rubbing and irritating his skin.
He has 5 T-shirts - orange, pink (shown), blue & white stripe, dark green and turquoise.
The VAIN LITTLE JERK has recently started to refuse to wear his turquoise one (he puts his paw up and refuses to allow it to be put on) but puts his head into the other colours and enthusiastically wears them.