What exactly is skin to skin?

Dafney • Married 11.3.2011 & Mommy 11.16.12 | Born & raised in New York, moved to Arizona '2015 💕 expecting baby #2 7.3.15!
When I had my first, delivered vaginally & wore a hospital gown. 
As soon as she was birthed, they placed her on my chest but I was still wearing a hospital gown. 
I know people say to try to breastfeed right away & skin to skin ..but what is that exactly? Baby naked? Me completely topless? Baby in diaper?