This has been a bugbear/argument of mine probably for 19 of the 20 years I've been playing, my first year I felt the need for all the kit, soon realised that actually most is unnecessary, especially wrapping yourself in layers of all covering tactical nylon, & ditched most of it.
Back then I was a lot fitter, but still found myself dripping before the safety briefing finished, & even now you look around the average safezone & there'll be some guys who aren't at their peak, maybe overweight, mature in years, generally unhealthy, or maybe a combination of all of the above, but their loaded up like their off to war for the next few weeks, not bimbling around a few a acres of land for the next 40 minutes.
& While their carrying everything bar the kitchen sink, the one thing their often lacking is fluids, "cos waters heavy innit" ffs.
I've seen loads drop mid game because of this mindset, & im surprised there's been no fatalities in the summer months (that I'm aware of ?)