Not exactly style and beauty but I'm working on a project that will mean spending all day outside in a couple of weeks. Think twelve hour days standing outside in exposed places or in buildings that haven't been heated for years. I really feel the cold and so I need to get some proper thermal underwear.
I like Uniqlo heattech but I wear it inside under jumpers. Would proper thermal underwear be a lot warmer? Or do I need to go for a ski type merino base layer?
The good thing with merino is that it really doesn't smell after a day of wear, so you don't need to have as many. Man made stuff you would need a fresh top every day. When skiing I just have two merino base layers that I alternate and hang up to air on the 'off' days. So although it's more expensive to start with, it might work out less so in the long run. I have bought stuff from Embers merino before, good quality, British made and looks like they still have some sale stuff on their website.
Merino is in the sale at Mountain Warehouse at the moment - just £15 for a top that keeps me warm when stuck on the slowest chairlift in the world at temperatures too far below zero to be happy outside! Merino really is the answer.
Aldi might have some merino baselayers left? I agree, get merino top and bottoms and be prepared to wear both. When I used to work on building sites I would wear tights, long johns, jeans and water proofs and about 5 layers on top .