Foul weather wear is clothing that is designed to protect the wearer from inclement weather, such as rain and cold temperatures. The two crossword solutions for this term are MACS and RAINCOAT. MACS is an acronym for 'waterproof Macintoshes, ' which are a type of coat made from a waterproof fabric. A RAINCOAT is a garment designed to keep the wearer dry in wet weather conditions. Both of these items are essential pieces of foul weather wear.