This is the 4870th most frequent Chinese word.
裙
"Skirt" or "dress."
裙子 here means 'skirt', which refers to a type of clothing item.
她喜欢穿红色的裙子。
She likes to wear red skirts.
裙 here is part of '白裙', meaning 'white dress', used to describe the appearance in clothing.
那位小姐的白裙优雅极了。
That lady's white dress is extremely elegant.
裙装 refers to 'skirts and dresses', denoting a category of clothing.