to put on clothes; to wear clothing (the act of dressing in garments).
子どもが自分で服を着る練習をしている。
The child is practicing putting on clothes by himself.
寒いから厚手の服を着る。
Because it's cold, I'll wear thick clothes.
彼はいつも黒い服を着ている。
He always wears black clothes.
外出する前に服を着るのを忘れないでください。
Don't forget to put on your clothes before you go out.
Idiomatic: used prenominally as '...が服を着たような' meaning 'the personification of ...', emphasizing that something embodies a particular quality.
彼の行動はまさに正義が服を着たようだった。
His actions were exactly like justice personified.
あの選手は優勝を目指す努力の体現で、努力が服を着たような存在だ。
That athlete embodies the effort to win; he is like effort personified.