Swaddle help

Brittany

I have the Swaddleme original swaddles I plan on using, but as a FTM I have no idea what to dress the baby in underneath. I tried doing some research online and didn’t find a definitive answer. We have central AC and keep the house between 68-72. What should the baby wear under the light swaddle? Short sleeve onesie? Long sleeve onesie? Footie pajamas? I’m so confused. Please help!