Found a couple studies, but IMO nothing definitive since they mostly are conducted on indoor trainer (no wind) or are measuring sweat output only, and not taking into account evaporative cooling effect (eg. Does sweat evaporate just as well when mixed with sunscreen, vs. technical fabric ability to promote evaporative cooling?)

Anyone have their own thoughts/insights/experiences to share whether for example a lightweight Longsleeve jersey or base with UPF 30 protection might compare to bared skin with SPF 50 lotion applied, in terms of allowing the body to regulate its temperature in hot/humid conditions?