There aren’t many times I wear a belt, and I certainly do not consider myself an expert on their use.
However, I’ve heard (and known) of a few trainers who spoke of the benefits of wearing different kinds of belts for different lifts.
For instance, the lever belts that Grizzly makes are one solid width for their entire length, which is ideal for some - but not all - exercises, and some people dislike their lack of versatility.
If you wear the type of belt that is tapered/narrower where the ends connect, it can sometimes be beneficial to rotate the buckle to the back so that the wider part covers your abdomen. The reason being you need more support over that area for certain movements.
Likewise, sometimes you need more flexibility/movement in a particular area. Tapered belts can accommodate that as well.
For more info, check the power lifting board, or ask our own JPM.
He knows almost everything about training.