Levis are soooo durable and thick! I use mine for painting and it keeps that paint off the clothes!
One pair of levi yeilds two aprons. And whatever size pants you are is about the size of apron you would want. So if you are making one for your daughter–and she is a 5T–that is around what pant size you would use. And if they are really short (your kid…not the pants)–you could use capris.