Летом я обычно ношу майку, шорты и лёгкую кепку.

In summer, I usually wear a tank top, shorts, and a light cap.

Breakdown of Летом я обычно ношу майку, шорты и лёгкую кепку.

• я: I
• и: and
• обычно: usually
• летом: in summer

Questions & Answers about Летом я обычно ношу майку, шорты и лёгкую кепку.

Why is летом used here instead of лето or в лето?

Летом is the instrumental singular form of лето, and Russian often uses this form to mean in summer / during the summer.

This is a very common pattern with seasons and some time expressions:

• летом — in summer
• зимой — in winter
• утром — in the morning
• вечером — in the evening

So Летом я обычно ношу... is the natural way to say this.
В лето is not normal in this meaning.

Can I leave out я?

Yes. Russian often drops subject pronouns when they are clear from the verb form.

Ношу already tells you the subject is I because it is 1st person singular. So all of these are possible:

• Летом я обычно ношу...
• Летом обычно ношу...

Including я sounds perfectly natural too. It can make the sentence a bit clearer or slightly more emphatic.

What does обычно do here, and can it go in a different place?