It seems that the decorative role of clothes will have diminished by then.

decorative 是形容词，由动词 decorate（装饰）加上形容词后缀 -ive 构成。decorate 来自拉丁语 decorare（装饰），词根 decor- 表示"装饰、美化"。 decorative 意思是"装饰性的、用于装饰的"，用来描述某物主要功能是美化而非实用。