Class 3 Hi Vis Short Sleeve Tee in Yellow
A class 3 hi vis short sleeve tee in yellow, for the months when a vest over a shirt is one layer too many.
Class 3 is the higher visibility specification, and getting it in a plain short sleeve tee rather than a vest changes how a summer shift feels. There is nothing pulled over the top, nothing riding up, and nothing to take off and lose. The yellow is the working colour rather than a styling decision, and it reads at distance in the flat grey light that makes people hard to see in the first place.
Wear it on its own through the warm months and as the visible layer under an open jacket the rest of the year. Buy more than one: a hi vis tee is only doing its job when it is clean enough to still be bright, and one shirt does not survive a working week.