Unless you are wrestling an odd weight class.. For instance, you weigh 180 and trying to make 192 weight class, and can't make the 172 weight class, then use the gear.. Otherwise, I've never seen anyone try to gain wait for wrestling.
When I was wrestling in HS, the people in the 125 weight class all originally weighted around 140. Basically, everyone was under 10-20lbs their natural weights. Its the only way to survive!