What should I were to revisit day?

I was accepted into a boarding school and the revisit day is coming up soon. I was wondering what I should wear. It is in the beginning of April and in MA.

Probably something like what you wore to the interview; respectable and within the school’s dress code, but not too fancy. Dress pants and a button-down/sweater should be OK.
Congratulations on being accepted!

Thanks
Would it be appropriate to wear jeans with a sweater and boots?

Not totally sure . . . that might be a bit on the casual side.
One more thing worth mentioning in case you’re not from New England, though: it could be raining or snowing, and even if it’s clear, there may well be some snow, mud, or both on the ground, so check the weather and bring any necessary outerwear.