However, here are some options depending on the context:
* A pair of trousers: This is the most common way to refer to a single unit of trousers.
* A suit of trousers: This could be used if referring to a set of matching trousers and jacket.
* A pile of trousers: This would be suitable for a large, unorganized collection of trousers.
* A selection of trousers: This implies a curated group of trousers.
Ultimately, the best way to refer to a group of trousers depends on the specific situation and the desired effect.