The guy wears tights? ,under his tracksuit?
You obviously got "Eddy"'s voice and I got "Junior"'s, neither of which are the most appropriate.
Long johns perhaps? Thermals?
Googling my local department store "collants" are opaque, what Americans would call tights. "collants diaphanes" are sheer, what the British would call tights. This is Canada, France may be different.
But you’re okay wearing them in summer?