I have been sewing a lot of jersey cotton, making a lot of leggings in particular. Today, one of my friends who bought two pairsof leggings said the bum seam on pair and the leg seam on another pair has come apart. I’m gutted as I went to my local sewing shop to discuss this, I was advised to change my thread to a stretchy polyester and i bought this and re threaded my machine. I noticed the upper loops were loose, so i increased the tension and moved the cutting blade back and that fixed that problem. I increased the left needle tension as advised but now i have two pairs of leggings which my friend said her kids have been wearing them everyday because they love them but i wouldn’t expect the seams to come apart after 10 days! i asked if the leggings were too tight and she said they are a good fit. My tensions on the machine are… 7465
If anyone else has had this problem, I would be so gratful for any advice or how to reinforce the seams.