On days where we don't leave the house (a.k.a. most days since she's only 3 weeks old), I just keep her in a cotton side-snap shirt, a diaper, and a swaddle. When we go for walks in the neighborhood, I'll put pants and socks on her.
I want so badly to dress her up in some cute things but I just don't see the point when we're staying in the house all the time and she spits up on everything.