Learn Hardcore Spanish (Spain): No me pongo el jersey verde a no ser que refresque por la tarde. - I don’t put on the green sweater unless it gets cooler in the afternoon.

So me pongo el jersey literally means I put the jumper on myself, and in natural English it often becomes I put on the jumper or I wear the jumper, depending on context.

The reflexive pronoun changes with the subject:

me pongo = I put on
te pones = you put on
se pone = he/she puts on

With clothes, ponerse is extremely common in Spanish.

Does me pongo mean I put on or I wear?

It can suggest either, depending on context.

In a sentence like this one, No me pongo el jersey verde a no ser que refresque por la tarde, the most natural English translation is often I don’t wear the green jumper unless it gets cooler in the afternoon.

Why? Because the sentence expresses a general habit or condition, not one single action happening right now.

So:

Me pongo el jersey can mean I put on the jumper
In a habitual sentence, it can also mean I wear the jumper

Spanish often uses ponerse where English might prefer wear.