You can not equip clothing in your hands, how would you add clothing to the clothing category!

Thanks

you add an item in your hand with the classical command for example, a machete : /sr add item 100
then you edit your server file :

/oxide/data/ServerRewards/reward_data.json

you search for the item machete, and modify it with the shortname of your clothing/armor/attire/food/heal

but you will have to change also the category number. ("category": 5, for attires)