Waffle tee is the new name for the top half of long underwear (thermals). It's called waffle because the pattern looks like hundreds of delicious little waffles.
You can wear waffle tees huge like a tall tee or tight like a tight tee. Both girls and boys can wear waffle tees. Some people wear a t-shirt over their waffle tee like it's ok, but it's not 1998 anymore.
Ayo, I got this new waffle tee from Big 5, but I got the women's version because I like the color. Good thing I bought it XXL.