Quote:
Originally Posted by mamapixie 
I used flannel myself, I hate sewing with stretchy fabric like t-shirts. I first used some old flannel items I had around the house, then have gone from there.
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I was going to say it may just be because it's stretchy fabric. Try using 4 layers of t-shirt instead of 2.
I've sewn with both flannel and t-shirt material. Flannel is by far easier. But t-shirts are economical (if they can't be worn otherwise!). You just have to use more layers.