Quick question... do you have green eyes by chance? I've often theorized that greens mean "EAT" to chams. I've use a number of green items and their first reaction is to shoot at it.
As many have said, reds tend to get noticed by chams. Also, stripe patterns simulate movement to many animals. [That's why the "zebra stripe" silkworms are a thing]
Congrats to all you cham folk who get to buy a new wardrobe, lol. Best wishes!