I think you should contact MrP and ask them what season it is specifically from, they should be able to tell you. Or contact YSL.COM give them this link and ask them if its the same. I wouldn't stress too much on the price difference, its very normal for different prices.
Guys i'm getting really confused, does the denim jacket fit true to size or not? Some people are telling me to size up
Also do you think they will restock the 3 passant belt on ysl.com?