Belinda, I cut one gown off grain but having the stripes match and it came out as expected-slightly twisted. The gown cut on grain didn't twist but the stripes were no where near matching. I'm going to have to think this through-would I rather have the stripes match and have a garment twisted or have mismatched stripes and not. I'm leaning towards the mismatch because who wants a twisted garment on a baby? The gown only has to match on the entire side seam it shouldn't be that noticeable if it is mismatched-especially to non-sewers-I hope.
Thanks for the link Marty, interesting site. My fabric had already been cut flat when I purchased it, big patches of dried glue along the cut edge. The fabric has stripes knit into it but they don't line up if the knit is on grain.