Update: Retailer-exclusive pre-order content is now confirmed to be coming west, as UK storefront ShopTo reveals it will be offering the orange workout suit with Pokemon Sword and Pokemon Shield pre-orders. USA retailer pre-order exclusives have not yet been announced.
Retailer exclusive content is reportedly coming to Pokemon Sword and Pokemon Shield, though, so far, this content is only confirmed for release in Japan. More specifically, reports state that two different online retailers, Amazon and 7 Net Shopping, will each offer their own pre-order exclusive DLC, and this DLC will vary based on the edition a player orders. This means that fans will need to pre-order both Pokemon Sword and Pokemon Shield from both of these retailers to get access to all DLC.
The DLC being offered with Pokemon Sword and Pokemon Shield pre-orders is a range of customization options for the player character. The Amazon Japan-exclusive pre-order DLC will be the "Stud Leather Boston" and the "Stud Leather Backpack." The Boston will be exclusive to Pokemon Sword and the backpack is exclusive to Pokemon Shield. It's not clear if the Boston and backpack are gender-exclusive at this time.
7 Net Shopping's pre-order exclusive DLC for Pokemon Sword and Shield includes a full outfit, rather than the back gear Pokemon trainer customization offered by Amazon. The outfits will include orange workout pants, an orange workout jacket, and an orange baseball cap, each with black highlights, as well as a black undershirt. Unlike Amazon Japan's pre-order DLC, it's confirmed that Pokemon Sword's bonus will be solely for the male player character and Pokemon Shield's will be for the female protagonist.
To note, this information originates from a report by NintendoSoup, and a source has not been provided, nor has Amazon Japan and 7 Net Shopping updated their Pokemon Sword and Shield listings with pre-order information for the DLC. Nevertheless, the images provided for the retailer-exclusive pre-order DLC appear to be authentic.
It bears repeating that this retailer-exclusive pre-order content for Pokemon Sword and Shield is currently only confirmed for Japan. It's unclear whether western retailers will also offer exclusive pre-order content, though it's a relatively common practice for the Pokemon franchise, and it's also unclear if the content that would be offered in the west would be the same as what is confirmed for Japan. Expect more information on this in the months to come.
Pokemon Sword and Pokemon Shield release November 15 exclusively on the Nintendo Switch.