/ Powerstretch - Base or mid-layer
I've used a powerstretch top as a thick base layer with a wind shell over the top in cold clear windy conditions (with a mid-weight insulated jacket for stops) on hillwalks in Scotland.
Works well for me if I'm moving at a moderate pace throughout the day.
I'd say it depends mostly on the type of garment. I wouldn't wear a full length zipper top as a base layer, but if the zipper is only for the neck part, then I guess that would be possible.
Having said that, when powerstretch is in use, I always have a thin polyester base layer beneath.
That's my 2 cents
FWIW, I normally wear a merino t-shirt under any powerstretch top, or pants under my PS salopettes. That way the mid-layer doesn't pong at the end of the day, but if you don't mind chucking it in the laundry after a day, I'm sure you'll find it very comfy.
I don't find PowerStretch very good at wicking, as a base layer. So, if you sweat a lot, you can end up with a cold, wet feeling, especially down the back.
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