I have a flat drying rack that i use to dry the sweaters. But I find that the sweaters tend to contract/shrink a bit, especially around the collar, when they are wet. So I stretch them out gently when drying them, and I was using cans and jars to "block" them out and keep the shape while drying.

But it occured to me that I could use pins (safety pins, embroidery pins) to pin the sweaters directly to the drying rack, and keep them in the right shape more effectively that way as they dry.

My question is: is it safe to pin the sweater in position when drying, after every wash? Or will doing this repeatedly leave permanent holes in the sweater, and ruin it? The pins I would use are the safety pins and little pins (with a ball on one end) that came in a sewing kit.