UK uniform tissue questions

I noticed some differences in the tissue the UK uniforms use for "tropical" and "temperate" weather.
Of course that's logic.

In the MTP range they use a 70% cotton/30% polyester mix for tropical/warm meather,

a 67%polyester/33% cotton mix for temperate weather,

and a 50/50% Cotton polyester mix for the windproofs such as smocks and so.

also the "tropical" version has a super "open" weave, after a few washes after new it's really nice to wear on a hot day when a wind is blowing.
the "temperate" version though I found a bit thin and cold for a "temperate" british fall/winter.

I also have a long experience with dutch uniforms, and what the British now call "temperate" was the dutch "summer/warm weather" version.
they had for a "temperate" version a tissue of 65/35 cotton/polyester almost twice the (tissue) weight of the UK "temperate" version.

Why would the MOD use such a light tissue for the (not so warm) UK winters?

nobody?

Sorry, I've never been able to figure out the logic in British MOD cloth types. Over the years I've seen more than one that didn't make sense to me.

Steve

yes, you're probably right, a pity, Iwould really like to know that, because I think that they really can do so much with these different types of tissues these days.