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suit (oneself) up
to get into one's uniform, especially an athletic uniform. The coach told the team to suit up for the game by three o'clock. It's time to suit up! She suited herself up and went out on the court.
Put on clothes for a particular activity, as in Come on, fellows, it's time to suit up for the hockey game. [Mid-1900s]
1. To put on clothing designed for a special activity: We suited up in our riding clothes.
2. To dress someone in clothing designed for a special activity: We suited up the children in their Halloween costumes. The soldiers were suited up for night patrol.