trousers, pants
褲 centers on a specific garment for the lower body: trousers or pants. The meanings are straightforward and concrete, with no abstract extensions.
褲 is a phono-semantic compound: the left side 衤 (clothing) indicates the meaning, while the right side 庫 (warehouse) likely contributes the sound コ. The character originally referred to legwear.
The left side 衤 is clothing, and the right side 庫 looks like a storage place. Imagine a warehouse full of neatly folded trousers: 褲 means pants.
For コ, picture a coat hanging next to the trousers in the warehouse: coat -> コ, and the clothing radical 衤 reminds you it's a garment.