Fit-Fitted | Commonly Confused Words

Fit

/fɪt/

To be the right size or shape for a particular space or item

No more fits, no more tantrums—just two dolls a night."I got to get fitted for another diaphragm.The pieces of the puzzle start fitting in my mind.

Specially made to have the proper size and shape; closely adjusted to something else

Fit is used as the present tense of the verb, meaning to be suitable or of the right size.
Fitted is the past tense and past participle of the verb ‘fit’, used to describe something that has already been made to the correct size or shape.
In some English-speaking regions, fit can also be used as the past tense, but fitted is generally more widely accepted in standard English.
When talking about a person in good physical shape, both fit and fitted can be correct, but context matters.
Think of fitted like a tailor who already finished adjusting a garment to the correct size.