I personally don't like flexothane but I know many who swear by it.
I prefer non flexing PVC oilskins as IMO they last much longer, also less fire shy than flexothane garments. Flexothane is the oilskin equivalent of the material used in "stretch jeans", I just buy PVC skins a little bigger than I would say a goretex or ventile equivalent and that solves that. The flex in flexothane eventually affects the water proofing over time.
When you're outside all day in low temperatures wind and horizontal wetness, protection from the weather and practicality trumps all other considerations, such as; kit vanity, a little trapped perspiration, etc. PVC oilskins or Flexothane oilskins more or less do the same job.
There's too much emphasis of breathability IMO, unless one is running or hiking with a big pack etc condensation isn't a big issue, bumbling around the woods, a walk in the country on a wet day, sat out by an open fire on a wet day etc oilskins are hard to beat, especially as one can turn a garment inside out and dry it over a fire, the difference between flexothane and PVC skins is that you can stand closer to the fire with the latter.
Then there's bang for buck, waterproofness v's cost. Both PVC & flexothane come out well ahead of everything else for low to moderate activity, PVC (medium to heavy weight) trumps flexothane.
I've worked outside (hard manual work) clad in both PVC and flexothane for years on end and if it's cold and wet, and I'm to be outside in it all day; then it won't be goretex ventile wax cotton or proofed nylon thats covering me
