Given the measurements are key photographs of a flat lay with a tape measure is the better way to give the very best idea of what the sizes are in the important places. Additionally of course hanger photos inside and out and if you want to be sure, hang inside out to give an idea of the lining.
eBay - price it as Buy it now. Don't bother with an auction unless you want to sell it for very little or achieve no bids. Overprice slightly and make it clear you will take offers. Remember you have fees taken off too.
Vinted - No fees, no returns (unless you make a dire job of describing it), no hassle (save for scammers) but also not as much money.
Vestiaire - bigger fees. Gets sent for verification but you can achieve good prices.
With all be explicit about everything. Make it a boring essay of every last smudge and crease so no one has any cause to claim it is not as described.