I was straightening the crosswise grain on a black crepe and was having a difficult time seeing the pulled thread...I could barely see the thread line. Then I had an idea...get my light box out. I was thrilled...it worked! It's so much easier to follow and cut the fabric without straining or guessing. Just pull your thread then lay your fabric over your light box and cut. Take a look at the photo, the line just pops. You can find light boxes at most craft or quilting stores but there are also tips here on PR on how to make your own.