Not a big "thermals" fan here - it doesn't often get cold enough for me to need them for warmth.
I like lowe alpine wicking T shirts as a base layer and Hom sport maxi underwear with the longish legs which are really well made & comfortable, whether it's warm or cold
I add a pair of ron hill tracksters underneath polycotton pants if it's cold / wet.
Have used thermal tops from C&A or the like for skiing - like a non brand norgie top - and they were good.
I never bought into the whole HH thing like some of my mates in the UK who obviously found this kit good enough that for 3/4 of the year they could go out on the hill wearing little more than their underwear !
Wool for me is a total no no - merino or not, it still itches.
I've a great Herdwick sweater (super scatchy) but need two layers underneath it to keep it at bay :yikes: