I make T-shirt quilts in my business. I do not stitch over the emblems because they are rubberized and the machine needles do not like them at all and if your needle breaks on them, it leaves a nasty hole. I just do meandering stitches around them and down the sashing. I find that if they are stretched on a frame, they do much better. No matter how accurate you cut your shirts, they seem to hae a mind of their own and do not lay as flat as regular fabric.