着ていく

wear (when going somewhere)

→ 着る
phrase Rare #26,599
wear (when going somewhere) Combines 着る (to wear) with いく (to go), indicating what someone will wear when going to a destination. 着ていけば means “if you wear it when you go.”
JA: 明日は何を着ていく?
EN: What are you going to wear tomorrow?

ダンス着ていく服はあるの

Do you have anything to wear to the dance?

普段学校には何着ていく

What do you usually wear to school?

海岸背広着ていく理由はない

There’s no reason to wear a suit to the beach.