彼女は服装に

she ... about her clothes

→ 彼女
phrase Rare #34,671
she ... about her clothes This is an incomplete phrase rather than a standalone expression. 彼女は means “she,” 服装 means “clothing” or “appearance,” and に marks the area or object affected by the following verb or adjective.
JA: 彼女は服装にとても気を使っている。
EN: She pays a lot of attention to her appearance.

彼女は服装に大部分のお金を使う

She spends most of her money on clothes.

彼女は服装にうるさい

She is particular about what she wears.

彼女は服装にこだわらない

She doesn't care much about what she wears.

彼女は服装に気を使わない

She doesn't care about how she dresses.

彼女は服装にかまわない

She doesn't care about how she dresses.