Cavalry trousers are light armor trousers in The Witcher 3: Wild Hunt that come in two forms:
Cavalry trousers (crafted)[]
Crafting Requirements 
Min. Required Level: Amateur armorer
Cavalry trousers (basic)[]
Can be found as random loot or purchased from the following merchants:
- All base game armorers except Zoltan Chivay
- Armors merchant in Nilfgaardian Army Group 'Center' Camp
- Merchant in the boatyard south of Refugees' Camp
- Merchant at Coast of Wrecks
- Merchant in Ursten
- Merchant at the sawmill northeast of Rannvaig
- Merchant in Mohrin Village
They are also guaranteed loot in two places in White Orchard:
- Underwater chest in the lake northeast of Abandoned Village (the water exit location during Contract: Devil by the Well)
- A metal chest in the unmarked Nilfgaardian camp by the southwestern road end of the map (but the soldiers there will attack Geralt for stealing)