Hospital bag/baby bag!

Emily • Married for over 2 years, TTC for over 1 year, 2 previous MMC, expecting my rainbow baby Sept. 2016! 💕
Okay ladies, what all do I NEED in my hospital bag and what does baby NEED besides blankets, and a few outfits?
I have one nursing bra and two sets of pajamas so far, they are stretchy enough to allow breastfeeding but do I need a gown also? 
I'm 30 weeks so I'd like to start preparing! But I don't want to take a boat load of stuff I won't need.