My new commute takes me on some pretty gross roads (including Interstate 5) and additional visibility couldn't hurt. What'd be nice are some simple t-shirts or polos made out of light synthetics in high-visibility colors. But they seem like a basic item, so I'm curious what y'all know of cheap sources online for shirts like that. I'd guess they'd likely come from safety or industrial stores.
When I was in Washington, a lot of the construction workers seemed to be wearing ANSI-colored t-shirts with three parallel horizontal stripes. I like the aesthetic of those compared to the standard ANSI pattern, so if there are sources for those that'd be appreciated as well.