。
Please don't forget to bring rain gear.
Literal
Not-forget-[without-ず] rain-gear [object-を] carry-come-[polite-request-てください]
雨具 (あまぐ) is a compound noun covering umbrellas, raincoats, rain boots — anything protective against rain. 持ってくる (bring) orients the motion toward the speaker; contrast with 持っていく (take away), where the motion runs away from the speaker.