Learn Swedish: Kläderna är fina. - The clothes are nice.

In Swedish, adjectives must match the noun they describe. Because kläderna (the clothes) is plural, the adjective fin (nice) takes the plural ending -a to become fina.

What does the "-na" at the end of kläderna do?

It is the definite plural ending, which acts like the English word "the". The base word kläder just means "clothes", so adding -na makes it kläderna (the clothes).

How do you say "a clothe" or talk about just one piece of clothing?

Just like in English, kläder is always plural. You cannot just take off the plural ending to get a single "clothe". To talk about a single item of clothing, you use a completely different word: ett plagg (a garment).

Does the word kläder have anything to do with the reflexive verbs in this lesson?

Yes! The noun kläder (clothes) is directly related to the verb att klä (to dress). A very common reflexive verb you are learning right now is att klä på sig, which literally means "to dress on oneself" (to get dressed).