The real cause of these yellowish stains is a mixture of the minerals (especially salt), mostly due to body oils and sweat mixing with the ingredients in antiperspirant or deodorant (primarily aluminum)
Be it socks, sunglasses or a bag, if your look is largely monochrome and neutral, or comprised of only one or two other colours, there's no reason a red accessory shouldn't work
It should be okay to wear a basic linen shirt on top
The atmosphere is festive rather than competitive, with live music stations positioned along the route, water and refreshment stops every half-mile, professional photographers capturing the spectacle, spectator cheering sections in key locations, and emergency medical support throughout the route to ensure everyone's safety and enjoyment
Men's short-sleeve button-up with comfort fit
But this polo wasnt made for the those people