White shows dirt and other contaminints, both biological and other particulate, and is, in some oriental cultures, the rfepresentative color of death, much as black is the representative color of death in US and UK countries.
The pullover knit shirts used in "summer uniform" by the FDNY were never my "thang". I preferred the older 7 button "military" style, as I felt it looked somewhat more professional, plus, I use the shirt pockets. The knits don't have pockets.
Yes, I know it makes me look a bit more like our FF and LEO brothers and sisters, but, to me, the EMT patch on my right shoulder is sometimes more important than the agency patch on the left.