pj bottoms and a t-shirt. I have nothing up top that can sag. Maybe somebody can make pj bottoms that have a shelf to help prevent the butt from sagging.
It aint cute, but usually yoga pants and one of my husband's old t-shirts. I also wear a cheap loose fitting bra to keep the girls in check. Sometimes they can get outta hand.
Sometimes lingerie Usually a bralette (http://www.victoriassecret.com/pink/bras/lounge-bralette-victorias-secret-pink?ProductID=1669&CatalogueType=OLS), sometimes with a tank over it, and boy-short bottoms
Cute little nightgowns...slips, babydolls, or little lacy short sets. I'm slowly not fitting in them so by third Tri, it's mainly little shorts and long stretchy VS tshirts.
xokell2 I have found mine at Forever21, Charlotte Russe and Dillard's for a good price. Of course Victoria Secrets has some cute and sexy ones too but they can be pricey-though the pink line is not as pricey.
t-shirt or tank with shorts or just underwear in the summer, and when it's cold I'll wear sweatpants and a t-shirt, sometimes a long-sleeved tshirt or sweatshirt.