The most common and most likely answer to this crossword clue is the 15 letter word MADE-TO-MEASURE
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More clues leading to the result MADE-TO-MEASURE
Buddy explains!

The straight part
We know that "fitted" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fitted = made-to-measure.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MADE-TO-MEASURE mean?
MADE-TO-MEASURE adjective- Designed and made to individual specifications. (usually of men's clothing)