Females of all ages wear these things. Maybe he enlisted the help of someone to assist him in picking out a gift..maybe he thought you would genuinely like them.
Just thank him, tell him not to gift you anymore, and donate them.
Was it just a coincidence that he was in the same place as you were in holidays, or do you feel like he stalked you?
Anyways it seems like maybe you two need to have conversations about boundaries and set some in place.
If you two are communicating often about general things, cut it out. Make the communication and dynamics strictly about the child, nothing else.
No visiting each other houses, no hanging out (if that happens)
Public places only to drop off child. If there is shared visitation.
Stop being physical together (if that is happening)
If he was always like this, you've tied yourself to him for possibly the remainder of your life by having a child by him.
Hopefully things will get better..if not, document and gather evidence and report him to the law if it's serious.