Does the flag on Dante's jacket change?
Solution 1:
Given the pictures found over Google images, it looks like the UK flag is just part of the character design of Dante.
- Example 1
- Example 2
- Example 3
There is also a side note about this flag on the DmC Wikia:
The Union Jack patch on the arm of Dante's coat was Ninja Theory's small way of adding in a nod to themselves as their offices are based in the UK.
But I 100% agree with you: it would've been a great idea to geolocalize the flag ;)