Thermal leggings/bib for long legs

I'm currently using DHB Flashlight Thermo bib tights in a medium and they seem to fit fine - 6'1 with 34" leg (two, actually) and around 34" waist.

I'd recommend just adding leg warmers to the bib shorts, or at least I found that to be the solution after struggling similarly. I am 6 foot and 34" leg. I bought some Lusso (British brand, decently priced) Max Repel leg warmers, anti-rain and come up very long - almost to the crotch (underneath the shorts, of course) in a size medium. Seem to be pretty good in anti-foul weather, so far. 

I advise the now which I found on  https://bit.ly/2Il2toFwhich is doing a nice bib and cycling long legs. And the best important part is they can customize, so maybe it helps us get the right size. It specializes in a 4D high impact pad. The layered chamois uses low-volume, perforated, multi-density foam padding. Four-way stretch, breathability, moisture, lightweight and lasting warmth. Anyway, hope you can find your one. Cause this is just my feeling. 

I can recommend Castelli. Their 3XL bibs work for me, albeit a bit tighter than I might like. I'm 6'7" with a 36-38" inside leg.

Another shout for galibier tights, I'm 6ft and size L is a little too long for me but wearable, M is spot on. Also one of the few places offering padless tights still, last time I looked. 

I'm 6'1" with 34 inside leg and don't really struggle with this. I will admit that the legs could be a bit longer in my bib tights but they're long enough to cover my socks and fit inside my overshoes. I currently have two pairs of bib tights on the go. One are Madison (size L ) and the other Decathlon but they no longer have the label so I don't know what size. I would highly recommend Galibier cycle clothing (https://galibier.cc/) as both excellent quaility and value for money. They are also very helpful with regard to sizing if you email them. The other leggings I wear for my daily commute are Tudor Sport (https://www.tudorsports.co.uk/) tights which are very comfortable and hard wearing (I wear them with braces) and they offer a made to measure service. I got mine made M with +2" on the legs. However I've just looked at their website and read the following: 

Note November 2020 : We are normally able to offer a Custom make option, Made to Measure to Individual Waist and Inside Leg measurements but with reduced production capacity due to Covid 19 restrictions we are currently unable to offer this service.

I hope the above is of help.