I think most or all of the manufacturers make a belt that is designed to work well with their bags/appliances. So for example I always wore Hollister and I wore a Hollister ostomy belt that was compatible with Hollister pouches.

I don't think the ostomy belt needs to have any bells and whistles, as long as the material is comfortable, it fits securely onto your pouch, and doesn't irritate your skin.

Your insurance may cover a one time purchase of an ostomy belt -- mine paid for one for me (I ordered it through the mail order pharmacy that provided the rest of my supplies).

My ostomy nurse chose the belt I used. I would speak to him/her.

If the reason for the belt is security. I would try the Coloplast elastic barrier strips. I find they work better than a belt. They are two half round trips you put over your wafer flange on the out side. I have never had a failure using these and I am very active. My ostomy nurse suggested I try them. You can get free samples from Coloplast.