Re planet X, I can recommend these as a recent convert to the world of Freddie Mercury bibs.
https://www.planetx.co.uk/i/q/CLPXP3BK/planet-x-pro-line-365x-3-4-length-bib-shorts
I recently got 3 pairs for about £50.
Good for up to 20 degrees it says - hell in certain northern parts it rarely climbs above that.
Recently wore them in a heatwave on a northern ride and was fine - because of venting/breathing through my lower leg/ankles I suppose.
Pad seems superior to some Polaris things I have used.
Looking forward to using them in colder bits of the year with legwarmers.
Very versatile I think - I think you could probably wear them through 3/4 of the year.
They don't exactly feel like fine tailoring/lightweight gossamer stuff as maybe favoured by the Rapha crowd but I find tough/on the heavy side stuff quite reassuring.
They have a zip, and for my maybe warped torso I find them pretty much ideal for comfort stops.
Why pay more?
would be interested in views from anyone else who has forced themselves into them.