Thank you to everyone that replied!
I ended up going with the same size calf but a longer length (39H), and they are a good fit.
I think my right calf is slightly bigger than my left because I had some trouble breaking that one in vs the left but much better length.
Last year I purchased custom Tucci boots directly from them to save a bit of money rather than purchasing from a store here in Canada. I’ll admit, not the wisest move since they were a great fit when they came but have since slid and now look ridiculously short! Maybe about an inch to an inch and a half below my knee.
It is embarrassing to wear them tbh. Especially as I have thicker legs and it just isn’t elegant.
So I went to purchase off the rack today. The girl put me in a 39 F which zipped up over my jods and socks with ease. They sit JUST below my knee. She said there is no way I would fit into the size down but I always thought you had to stretch out leather boots for the perfect fit?
I want to return them and try for a taller, tighter fit but I am right at the edge of the size down so I am worried about doing that.
Length of Calf: 47cm to back of knee
Calf Width: 35.5 cm at widest point with jods.
I am thinking I should go for either the:
39 H (larger size) or 39 G (smaller size).
For reference, I also purchased the mini chaps years ago in a M++ which length-wise fit amazing but they stretched out too much in the calf.
**My question is: Is going up 2cm in size too much for the length? And would it be unrealistic to think the smaller calf-sized boot would fit my leg at 35.5 cm? **
Oh - just incase this matters: they would be the Harley version.
Edit: My image of the size chart didn’t show up. Here is a link.