waterproof clothing; waterproof garment
General term for clothing designed to keep water out, such as raincoats, waterproof jackets, or wetsuits.
On rainy days, I go out wearing waterproof clothing.
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).