I agree with this , chest size.I find that the chest sizing is the most important number to look at on the size charts for neoprene.
I am not tall like you guys , more like a short solid block.
For the first time ever I have been able to buy wetsuits 'off the rack' and not made to fit, and it was the chest sizing I found worked.
The stretch of modern wetsuits is amazing, something we could only dream about 'way back when'.
Three new wetsuits, a 5,4mm a 3,2mm and a 3mm.
I did have to trim the legs and arms to length for my "Ducks Disease", arse too close to the ground, that is.
