when i try to sculpt the belt, it always end up with too thin parts and too thick parts aswell.
i have also geometry generated inside the belt wich is a pain to get rid of.
do you have tips not to generate these issues ?
It sounds like you're possibly being too heavy-handed with the changes to the belt once it has thickness. Primarily you want to focus on the flatness of the edge thickness and avoid too much smoothing or inflating the broad width of the belt. The inflation and smooth brush will both cause the thickened sides to either get thicker or too thin.