Learn Hardcore Italian: Rimettetevi il cappotto prima di uscire, fa freddo. - Put your coat back on before going out, it is cold.

Rimettetevi is the second person plural imperative of the reflexive verb rimettersi, literally “put back on yourselves.” In context it means “put your coats back on.”

What tense, mood, person, and number is rimettetevi?

It’s in the imperative mood (used for commands), addressed to voi (second person plural). The ending -ete marks the 2nd person plural of an –are verb, and -vi is the attached reflexive pronoun.

Why is the reflexive pronoun vi attached to the end of rimettete?

In affirmative imperatives of reflexive verbs, Italian requires you to attach the reflexive pronoun after the verb. So you take rimettete (the imperative form) and add vi, giving rimettetevi.

Why is there ri- in rimettere instead of just mettere?

The prefix ri- means “again.”
• mettere = “to put on”
• rimettere = “to put on again” or “to put back on”
Here it implies the coat was taken off and now needs to go back on.