summer clothes; summer clothing
Refers to clothing worn in summer; a somewhat literary or elegant term compared to everyday 夏服.
夏衣に着替えて、涼しい風を感じた。
I changed into summer clothes and felt the cool breeze.
Compound of 夏 (summer) and 衣 (clothing, garment). The reading なつごろも is a native Japanese reading (kun'yomi) for both characters.