General:
* Apparel
* Attire
* Clothing
* Garb
* Habiliment
* Raiment
* Vestments
* Gear
* Outfit
* Ensemble
* Threads
* Duds
* Rig
Formal:
* Suit
* Gown
* Tuxedo
* Dress
* Uniform
Informal:
* Jeans
* T-shirt
* Shorts
* Pajamas
* Sweatpants
* Tank top
Specific Types:
* Tops: Blouse, shirt, sweater, jacket, coat, vest, sweatshirt
* Bottoms: Pants, jeans, shorts, skirt, leggings, trousers
* Footwear: Shoes, boots, sandals, slippers, sneakers
* Accessories: Hat, scarf, gloves, belt, jewelry, bag, purse
Figurative:
* Skin (referring to clothing as a "second skin")
* Armor (referring to clothing as protection)
* Wrapping (referring to clothing as a covering)
Slang:
* Duds
* Threads
* Rags
* Gear
* Kit
* Getup
The best word to use depends on the context and the desired level of formality.