Darse un capricho

Darse un capricho
 

How caN I say "darse un capricho " in English?

There are different ways to say this, depending on the context.
What is the context?

when you are a good saver but from time to time you spend some money on a fancy restaurant eating expensive things.

spoil yourself ? Pamper yourself? can u use the word treat?

All three can be used, when you're a thrifty person.

how can you use treat? treat yourself?

Yes, 'treat oneself' is the model; substitute a person-appropriate possessive determiner to personalize the sentence.