I'm a woman, but I prefer tees to be loose & comfortable, so I NEVER buy "women's sizes" & I avoid baby doll tees at all costs. I generally buy men's XL or 2XL, and get annoyed when I see designs that are deemed "girlie" only on the itty bitty girl sizes. Full sized, busty women like girlie designs, too. ~grin~
All that said, I'd thikn may of your creatures & cuddlies could make fab tees.
I think it's an awesome idea! I myself am not interested in a t-shirt right now, but I think, since you have so many followers, a lot of people will be! Your drawings certainly are worth putting on a shirt!