This is a cool jacket. It's a lot like the Sonic 2 theme jacket, with the same white sleeves and red front. However, it has only a "Sega" embroidered patch, and none of the round ones found on the other jacket. This time, the design on the back is a large combo of embroidery and fabric. It has modified stock Sonic holding a bottle of Coke. As you can see, it goes along with the above hat and pin.
Sega Europe staff was given these to wear at events all over Europe. The home-base for this is supposed to be in Germany (hence the placement of this here) but it could be seen being worn all over Europe and also in UK bus tours. This jacket is rare, as you had to be a Sega staff member to get it. 

(TODO: Remove duplicate info) This item was found twice on SonicGear (with the same images) so below is the version that was found on the unknown page: 

Well, this is quite a nice jacket. It's made to look like a high-school "Lettermans Jacket" (often issued in sports) with leather look sleeves and cloth body part. You can see that it has the usual stretch/stripe collar, bottom and sleeve cuffs. The top front has embroidered on "Coca Cola" logo. The sleeve features a nice big "SEGA" patch while the back has Sonic holding up a Coke. It's not know if this is a patch or an embroidery.
Seem familiar? It should, there are more things with this design on Germany Sonic. But is the coat German? It's not common at all. The photo taker/collector is unknown. Is this yours? Write in!