は服に

on clothes; for clothes

→ は
phrase Rare #22,395
on clothes; for clothes The natural phrase in these examples is 服に. The particle に marks clothes as the target of an action or spending, while は is a separate topic or contrast marker when used before it.
JA: 私は服にあまりお金を使いません。
EN: I don't spend much money on clothes.

マリアは服にたくさん金を使う

Maria spends a lot of money on clothes.

マリアは服にたくさんお金を使う

Maria spends a lot of money on clothes.

次郎は服にさっとブラシをかけた

Jiro quickly brushed off his clothes.