Unexpectedly opened and worn, oddly - suggesting it's this? (8)

'it's this?' is the definition.
The definition suggests a singular noun but the answer is not.

'unexpectedly opened and worn oddly' is the wordplay.
'unexpectedly' is an anagram indicator.
'and' says to put letters next to each other.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternating letters of 'worn' are 'wr'.
'opened' after 'wr' is 'wropened'.
'wropened' anagrammed gives 'PREOWNED'.

'suggesting' acts as a link.

Can you help me to learn more?