Would you buy a tee shirt online if you didn't know how it fit?

I have started selling tee shirts online about 3 months ago. I've sold some but my sales don't match the traffic that my site gets. Which means i get people to come to the site I just can't get them to buy. I understand that there are those who just might not like my designs, but other than that I was wondering if the fact that none of my tees are displayed with a model actually wearing them does it affect your decision to buy an article of clothing online if you don't know how it fits an actual person? if it doesn't what factors do?