1. First thing you wanna do is buy or find an old pair of black shoes, within this "Vans" like style, preferably.
2. Get on your laptop or phone and search up a Union Jack photo. Or use the one I have posted as reference.
3. Grab a white color pencil and sketch out the flag on your shoes.
What I did was start with the very middle (plus sign looking part) then I freehand painted the outer corners. Do what you're comfortable with!
4. Last but not least, paint em, let em dry, then ROCK EM OUT!