Scratching/pinching

I remember my first going through a phase of pinching/scratching whilst feeding and now my second ( 6 months old) is doing the same and it’s driving me insane.

He pulls soo hard on my skin, I keep his nails trimmed but it still hurts so much even if I try and keep material over myself he manages to pinch through it 🥲 I try holding his hand or playing with his hand but he doesn’t like that, I’ve tried mitts but he gets frustrated and cries, I’ve also tried a fidget/teething necklace to try and keep his hands busy but it seems to be a comfort action to grab and twist the skin as he feeds. I have marks all over my chest and it’s starting to make me really not enjoy breastfeeding I’m starting to feel sick each time because I know he will pull and scratch at me 😩

Any other tips I can try?