underpants; briefs; panties
Refers to underwear worn on the lower body. In Japanese, パンツ alone often means underpants, especially in casual contexts.
I bought new underpants.
I take extra underpants when traveling.
Often used for women's trousers or specific types of pants like jodhpurs, breeches, or swimming trunks. In compound words (e.g., ジーパン, 半パン) it can refer to various legwear.
She is wearing white trousers.
I forgot my swimming trunks.
It was cold, so I put on thick pants.
I took off my pants before getting in the bath.
My pants got torn while I was playing.
パンツ can mean either trousers (casual, especially in fashion contexts) or underwear, whereas スラックス always refers unambiguously to dress trousers.
pants; underpants