Yes, Raze posted it last week (I also expected a seperate email about it, but never got one).http://larian.com/forums/ubbthreads.php?ubb=showflat&Main=68311&Number=608603#Post608603
The hoodies are in US sizes, and the t-shirts international (the Vault still needs to be updated for the t-shirt sizes).
T-Shirt size chart (international sizes)
Hoodie size chart (US sizes)
Think it's too late to change now though as I just got an order processing email plus the Larian vault now says:
Shipping addons and rewards has started. You can no longer make changes to your address or physical options. If you still want to receive your physical rewards and addons and your address was not filled in on September 7th, 2017, get in touch with Larian.