The most common and most likely answer to this crossword clue is the 9 letter word NECKLACES
I've seen this crossword clue in The Guardian
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More clues leading to the result NECKLACES
Buddy explains!
The straight part
We know that "They might be fancy, sleek — can be worn by many?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they might be fancy, sleek — can be worn by many? = necklaces.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 NECKLACES mean?
NECKLACES noun- An article of jewelry that is worn around the neck, most often made of a string of precious metal, pearls, gems, beads or shells, and sometimes having a pendant attached.
- Anything resembling a necklace in shape.
- A device used in necklacing (an informal execution); a rubber tyre that is filled with petrol. It is placed around the victim's chest and arms, and set on fire.