Ebay won't 'sort it out'.
Only private sellers can refuse returns but they are allowed to say no.
If you look at the original listing, it will state 'no returns accepted'.
It is better to buy clothes from business sellers who have to accept returns for any reason.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)