In reply to Fraser:
> I've found the Decathlon 'Wedze' thermals long in the body and arms
If you're going to Decathlon, check out all their 'departments'; most have base layers of some sort, but their website is very 'department' stovepiped, rather than product type, so if you look at Wed'ze (skiing) base layers, it won't show their Kipsta (football) base layers, or their Kalenji (running) base layers, or their Solognac (hunting) base layers, or...
Feel free to provide feedback to dissuade them from this foolish practice; I have...