Chain Pants can be found in New Horizons. You can order it from the catalog. This item fits the everyday and theatrical fashion themes.
ACNH 2.0 Furniture List Animal Crossing Database and Wishlist
Mobile - Animal Crossing: Pocket Camp - Chadder - The Models Resource
Chain Pants Animal Crossing Database and Wishlist Maker - VillagerDB
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Villagers list
Animal Crossing Database and Wishlist Maker - VillagerDB
Villagers list
Animal Crossing: New Horizons (Switch) - Digital Download
m/ - Animal Crossing General #2
Create a ACNH Villager Wish List Tier List - TierMaker