Even though I’ve been a seamstress for sixty years (ouch!), recently I’ve had problems with both retail and handmade blouses and jackets. This doesn’t always happen, but the latest occurance is a swim cover-up – a simple design made from a front & back with extended cap sleeves, a faced neckline with a 5″ slit down center-front. When I put it on it looks fine, but after a few minutes it “rides up” on my neck and the shoulder seams pull towards the back. Any help will be appreciated!