I weave, but have not woven rugs. I help with a group of older weavers who weave for a major fundraiser every year. One of the weavers has woven small rugs and tapestries successfully in the past on the jack loom she uses. She recently wove a very good looking rug that is the largest rug she has woven yet, roughly two and a half feet wide and four feet long. She used cotton carpet warp for the warp, and two colors of denim for weft. It looked really nice when she took if off the loom and she had no problem with draw-in, but after she washed the rug there are clearly visible spaces between the wefts. You can see light between all the rows when you hold the rug up to the light. What can she do when she weaves the next rug so she doesn't run into this problem again?
Thanks for your help!