It’s just a visual play on their aggressively trademark-protected (but often copied) plaid.
In fact, it’s part of a larger narrative at Burberry, where their IP became so damaged by knockoff fakes (and, for a while, a popular association with British “chav” culture) that they had backed way the hell off that plaid for a decade or more, and it was only brought back recently, in the September 2017 fashion shows. The creative director is clearly trying to bring it back, make it new, and make it, uh, “relevant” I guess. I applaud the attempt, at least.
