Fitter (noun)

1. A person who installs or maintains equipment or machinery.
2. A person who adjusts or alters clothing to fit a particular person.

Origin:

Mid 16th century: from fit + -er.

Examples:

1. He was a fitter for the power company.
2. She was a fitter in the tailoring shop.
3. The fitter checked the machinery and made necessary adjustments.
4. The fitter made sure the clothes fit the client perfectly.
5. The fitter was skilled in his trade.