Refers to a sleeveless outer garment that hangs from the shoulders, often used for fashion or warmth. The same word can also mean a geographical cape, but that sense is not covered here.
It was cold, so I quickly threw a cape over my shoulders.
She was wearing a red cape.
She took the stage wrapped in a colorful cape.
For garments counted as outfits — suits, coats, dresses; thin tops are more often 枚.
Borrowed from English 'cape'.