they also do that
i've ordered from a lot of yoox-group stores (stone island, jil sander, diesel etc) and everything was shipped out from the yoox-group warehouse in bentivoglio, italy
returns also go to that place.
the inventory is sometimes shared by different yoox-group stores, e.g. if a product is sold out on ji- sander online store it is also sold out on thecorner.com