My two cents is that I would be a little hesitant if you have never seen or felt this fabric before. I have not been happy with a couple of the pieces of fabric that I bought online at WM so I sent them back.
I just bought muslin at JoAnn's with my 50% off coupon and I think you would be further ahead to check there. They have several different price points and you can see what is going to meet your needs the best.
JMHO