How do you deal with underbelly sweat?

I’ve been wearing pants below my belly since I got a belly. I tried the “proper” way years ago but when I would sit my belly was painfully squeezed by the pants’ waist.

Now, I’ve finally relented and am buying pants to go over my belly and sit at my so-called waist. I’m happy to learn that stretchy pants don’t have the painful side effect and I have far fewer worries of my pants falling down despite not having a butt. My undies are all sized to sit under my belly but tend to roll down in back. So I’m considering buying bigger ones to go over my belly or my large lower back, but I sweat so much between my belly and body. My pants and undies have been absorbing the sweat and I know that without either in place I will be very uncomfortable.

My only idea is somehow wear undies under my belly and over my large lower back. I’m not sure that it’s possible and am nervous to try because of the expense of trial and error. Some advice would be very helpful. Thanks