Tips on getting toddler to stop putting hands down shirt

He is 2.5 & I have been done nursing for two months now (waited to be out of the woods of sickness season before weaning) and he STILL is reaching his hands down my shirt. It is becoming infuriating and I am losing my patience for it. I weaned my first by 25 months and didn’t have this issue. It might be exacerbated today since he woke at 3pm and wouldn’t settle so I have been up since 3 and am sleep deprived. When he’s tired or we are snuggling or even when I am just holding him he sticks his hands down to hold my boob or try to play with my nipples. I tell him to stop or set him down every time and it’s getting no where.