All of my most interesting experiences entering the US seem to come at the Detroit border. Very weird, all things considered.
That said, I was asked whether I spoke English at the Buffalo border once, while the agent was holding my British passport.
Pretty sure it'll be the stripes, as per the image on this: https://www.brightonandhovealbion.com/news/2018/march/match-preview-for-manchester-united-vs-brighton-and-hove-albion-on-17-mar-18/
Our colours are usually shown in the corner. Here's the yellow at Everton...
Canada's Sportsnet not rating our new kits very highly - still finished above Palace though! http://www.sportsnet.ca/soccer/fashion-file-ranking-new-premier-league-uniforms/