"I have some new tops and some pre-loved tops" is correct. Note the hyphen. ) "worn them just once" has no grammatical connection to the rest of the sentence.
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"I have some new tops and some pre-loved tops" is correct. Note the hyphen. (Personally I find the term "pre-loved" enormously annoying, but that's just me.)
"worn them just once" has no grammatical connection to the rest of the sentence.
anonymous I have some new tops and somepre lovedtops that [have been worn / I have worn]themjust once.
As shown above.
CJ