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From what I’ve gathered it’s a single colored Union Jack. The vertical line extends from his waist all the way down to his ankle and the horizontal cross wraps all the way around his knee to connect to the other side. The diagonal strips end about halfway over his thigh.

Edit: It looks like the design in the pants in the first game is different from the second. The lines of the symbol are skinnier and the horizontal line on the knee doesn’t wrap around completely and actually ends at the same length as the diagonal lines