na-adjective
neater; sharper; more put-together
Describes clothing, appearance, or style that is cleaner, more polished, or more formal than usual. Often used in fashion contexts to mean 'dressy casual' or 'smart casual'.
今日はきれいめな服を着て出かけた。
Today I went out wearing neater clothes.
そのジャケットを着ると、きれいめな印象になる。
Wearing that jacket gives a sharper impression.
Derived from きれい (clean, beautiful) with the suffix め, which indicates a tendency or degree. The combination means 'on the neater/cleaner side'.