RuneScape Classic Wiki
The main RuneScape Wiki has an article on: Slaves Robe Bottom
The Old School RuneScape Wiki also has an article on Slaves Robe Bottom.

The Slaves Robe Bottom is part of the Slave Robes disguise used during the Tourist Trap Quest. Wearing these robes is essential to gain access into the mining camp cave. The first set of robes is obtained by trading a Slave a set of Desert Robes, but the Slave robes can be reobtained by killing a Slave.

Dropping monsters

Monster Combat level Quantity Rarity
Mining Slave 16 1* 1Always

*Only ones within the Desert Mining Camp mine drop, if player does not have one in their inventory

See also