Formal:
* Clothing
* Attire
* Garment
* Habiliment
* Dress
* Raiment
Informal:
* Clothes
* Gear
* Outfit
* Threads
Specific:
* For specific types of clothing: You could use terms like "attire," "garment," "costume," or "uniform," depending on the situation.
* For clothing for a particular purpose: "Workwear," "sportswear," "evening wear," etc.
The best word to use will depend on the specific context and the tone you want to convey.