noun
waterproof clothing; waterproof garment
General term for clothing designed to keep water out, such as raincoats, waterproof jackets, or wetsuits.
雨の日は防水着を着て出かけます。
On rainy days, I go out wearing waterproof clothing.
この防水着は完全に水を通さない。
This waterproof garment is completely impermeable to water.
雨具 refers to rain gear in general (umbrellas, raincoats, boots), whereas 防水着 specifically means waterproof clothing.
Compound of 防水 (waterproof) and 着 (clothing).