Any suggestions on dealing with an incisional hernia with an ostomy?

I got my colostomy in June, and got an incisional hernia around October. The hernia is very large and cannot be repaired. I tried a support belt but it didn’t really hold in the hernia. Someone suggested a tight corset or tummy control underwear. I want to hold the hernia in because I can only wear leggings and tunic tops now, but I don’t want to restrict the colostomy. Any suggestions?