Sorry, I'm doing like a bajillion posts. So I'm guessing your baby is due a bit ahead of my midsummer baby and the advice on not getting lots of newborn clothes is pretty good. Now, maybe it'd be different with a girl, but our boy ran very warm. So unless we had visitors or left the house (in the car, not the stroller), he was in a diaper and a muslin swaddle. Unless you keep the AC way low or something. He had a lot of newborn clothes that he never wore and even more that he wore maybe 1-2 times. And when he started daycare we just sent him in sleepers. Didn't bother changing unless he got dirty overnight (which unless a diaper leaks or spit up, they aren't doing a whole lot overnight generally)
Daycare had pajama day once a month? Lol, every day is pajama day. I wouldn't bother with shirts and pants until they are moving more. Easier for daycare to change diapers when they're in sleepers anyway.