What is the collective noun for uniforms?

There isn't a commonly used collective noun specifically for uniforms.

However, you could use a more general collective noun depending on the context, such as:

* Set: "A set of uniforms"

* Outfit: "A collection of outfits"

* Ensemble: "A complete ensemble of uniforms"

* Wardrobe: "The school's wardrobe of uniforms"

* Supply: "The supply of uniforms for the new recruits"

Ultimately, the best collective noun depends on the specific situation and what you want to emphasize.