The art number should tell you what year and season it is from. Off hand I can’t remember whether it’s the first three digits or the last three.
https://www.artchecker.co.uk/
I follow these people on Twitter. Might be worth contacting them for an idea on price. They are dealers so may be on the low side. From my limited knowledge it tends to be the 80’s and 90’s stuff (mainly jackets) that go for big money. Recently I’ve seen these people sell dead stock from the late 80’s for £1100 a jacket and it goes straight away.
https://www.toohotlimited.com/
Sent from my iPhone using Tapatalk