The most common and most likely answer to this crossword clue is the 7 letter word TARTANS
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More clues leading to the result TARTANS
Buddy explains!

The straight part
We know that "cloths with plaid patterns" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cloths with plaid patterns = tartans.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 TARTANS mean?
TARTANS noun- A kind of woven woollen cloth with a distinctive pattern of coloured stripes intersecting at right angles, associated with Scottish Highlanders, different clans having their own distinctive patterns.
- The pattern associated with such material.
- An individual or a group wearing tartan; a Highlander or Scotsman in general.
- Trade name of a synthetic resin, used for surfacing tracks etc.
- To clothe in tartan.
- A type of one-masted vessel used in the Mediterranean.
- A kind of long covered carriage.