A few comments for anyone looking to buy a shirt. The shirts on the UK store (Volvo + Sweden) are much thinner and have a slipperier feel to them. They feel kinda like underarmor actually (although the label says 100% cotton). The US store shirt (Saab) is much bigger despite being the same size (ordered S from both), the UK small actually is a bit too small for me, while the US small is perfect. Also, the design print on the US shirt seems to be of much higher quality (although time will tell - especially after a few laundry cycles).
EDIT: The design is also a much better proportion on the US shirt - it actually fits on my chest, rather than wrapping around. But this may just be how the designs were uploaded to the sites. I did notice the Volvo design on the US store was smaller, and in retrospect, I should've ordered that one.
Yeah, despite using the same backend, the sites do the designs in totally different ways, kind of a headache, also the printers used by both would be different, hence a different print area, the system needs to show a better preview both while uploading and at sale, i try to line it up equivalent with my redbubble versions but that doesnt always work...
The UK design area is quite large, i thought it would be smaller than that, though remember it doesnt scale up for 3xl, so maybe they went for medium fit and everything else as is, looks good anyway