Is there a market for "Furry Forever" Stuff?

So far I've made polo shirts, Tee-Shirts, Denim Shirts and Caps. All have been embroidered.

They go over "OK" but there's been no real demand or interest.
However when I put a cap in a Charity Auction, it goes for about $35 on average.

Should I try printed T-Shirts?

More caps?

Should I do some pins?

Should I just give up on it?