Think of one layer pulled onto each leg, on its own, without a seat or a doing the real work. What that layer is for decides which kind you are looking at: a layer that guards the leg from mud and thorns, or a layer that follows the leg so closely that it can be worn as trousers. The word is always plural, because there are always two legs.
可以想成「一條腿各自套上的一層」。那一層是用來做什麼的，決定了它是哪一種：一種是擋泥、擋水、擋刺的保護層；另一種貼得很緊、跟著腿的形狀走，緊到可以直接當褲子穿。這個字永遠是複數，因為腿本來就有兩條，所以英文用 a pair of leggings 來數。
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