Vestiaire is a great website, but there’s some glaring issues that see me using competitors, and spending my money elsewhere. I’m a man and buy mid tier priced items (ties, shoes, T-shirts etc). About 80% of sellers do not offer direct postage, authentication (especially to Australia) and dramatically varied postage costs, regularly see the price of items double. As an additional cost, it should be negotiable, but rarely is. As is dissuades a purchase, I can only guess that the authentication is a huge money earner for the website - and where a large chunk of their income is derived.