What's the thickness of a "slub cotton" t-shirt?

When the fiber is spun unevenly it results “slubby” yarn. When that’s woven into cloth, you can see the thicker parts as well.

Most of the slub cotton tees I’ve seen lately have been quite thin, and can be see-through in spots. That’s not necessarily true of all slub fabrics, but I’d be especially leery of ordering one online without being able to see it in person first.

To my way of thinking, it usually means beware of thin, weak sections of fabric. I wouldn’t buy it without seeing it first.