What stands out is the crew neck, which is cut wide enough for easy breathing.
Hi Viz Sleeveless T-Shirt V-Neck Sleeveless Safety Security Work Wear Top UIK
I like that the striped pattern is reversible on some colorways of this shirt.
New Walls 2pk Working Mans HI-VIS YELLOW Pocket Tees Short Sleeve T-Shirts Sz XL
A nice touch: the solid shade here is versatile enough for any season.
TSA Hi Viz Shirt Mens 6XL Yellow Long Sleeve Pocket Tee Casual Class 1 2 NWT
A crew neck like this one frames the neck without adding bulk or weight.
Shirt Mens XL Yellow Hi Vis Reflective Lot Of 2 Classic Industrial Supplies Work
The solid pattern keeps the focus on the fit and fabric quality instead of prints.