All-in-one tights and top

Anyone wearing something like this, maybe in winter?

Santani waterproof bib tights with built-in mesh baselayer top.
https://www.santinicycling.com/en/clothing-cycling-man-tights/vega-dry-bib-tights-4334.html

If so
how waterproof is it?
How breathable is it?
Does the waterproofing fade over time?
Have you paired it with something like this? https://www.sportsbikeshop.co.uk/motorcycle_parts/content_prod/415892

Thanks