Is there a trick for sewing nylon type fabric. I have some nylon pants, it's reallly soft, is there such a thing as brushed nylon. I need to shorten about 1 inch, of course those useless zippers near bottom of both legs. I decided to rip those out & just sew seams together there. My machine sews about an inch, skips next inch then sews another inch or so, then skips again :-( what's up with that.