Hi Pammer:
I found this underwear at Target by Maidenform called Self Expressions. There are two different styles: boy shorts or thigh slimmer, but both are hi-waisted.
They are about $20.00. I have worn them for occasions and they work really well for me. In the past, I tried Jockey Sports for men and pregnancy belly bands. Neither worked for me. I also have underwear from Ostomy Secrets. I am not very big. The Maidenform works well for me. They are soft and comfortable and keep your abdomen flat. I still have output, but it is very light until I take the underwear off.
It looks like there are options here that I haven't tried, so I may.
Good luck, it is hard to get past your comfort zone the first time.
Pray for peace, Hana