What size clothes should I bring?

Lynzee • Mommy to Ammarie, born on March 3,2016!
Help me please lol :) 
I don't want to overpack for hospital (this hospital bag is my latest obsession 😁), but I want to be prepared. I wanted to only bring 2 outfits for me.. First outfit:
Stretch pajama pants
Tank top for easy access nursing 
And a loose cardigan type pajama top just to wear when we have visitors. 
Coming home outfit: 
Black stretch pants 
Tank top 
Another loose cardigan pajama top 
However, I have several size tank tops and pants... How do I know what size to bring? Or should I just pack 3 outfits, since I don't know what my body will look like after birth?