Well, can you make a pretty good guess at someone’s profession and wealth by looking at them? Putting aside actual political apparel and some hobby/in-group indicators (EG RealTree camo or anime merchandise) that’s probably the correlation.

Back when image recognition AI was the hot topic I recall someone did a study which used it to identify the vehicles parked in front of homes and businesses from street view photos, and used it to predict a county’s overall political leaning with very high accuracy. I’m sure that same logic extends to clothes, hairstyle, accessories and cleanliness.