Waist
“Before becoming obsolete due to advancements in tailoring, belts such as this were used for holding up trousers and the like.
— In-game Item Descriptions
Removal
With the release of Endwalker, the waist slot was removed. Belts are no longer possible to acquire, and any existing belts can no longer be equipped. This is due to the fact that belts did not have any visible appearance on the player character model since Patch 2.0, they had low impact in stats (comparable to accessories), they were not exciting to loot, and they took up the same amount of data as any other gear.
With the data (Specifically, armory slots) freed up from the removal of belts, 15 slots were added for weapons, 15 for rings, and 5 are reserved for later use.
Because belts were removed in patch 6.0, they were not subject to the concurrent stat squish. Therefore, the belt stats shown will appear to be higher compared to equivalent item level gear in the current version of the game. Belts had the same amount of attributes as accessories, but had meaningful amounts of physical and magical defense somewhat lower than that of head, hands, or feet armor.
Images
An example can be seen by comparing the image of Minfilia from during Legacy with the image of the Rising vendor. The 
Raptorskin Survival Belt seen in Legacy was not attached to any body slot item.
Meanwhile, the 
Cobalt Plate Belt can be seen fused with the 
Cobalt Cuirass in the post-ARR image.
-
-
the Rising vendor -
Cobalt Cuirass with Plate Belt fused on.
| Weapons |
| ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tools |
| ||||||||||||
| Armor | |||||||||||||
| Accessories | |||||||||||||
| Equipment | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Medicines and Meals | |||||||||
| Materials | |||||||||
| Other Items |
| ||||||||
| Unobtainable | |||||||||
