Did your Mod 3 trousers match with the size chart? I have 2 of them and they did not. The Thigh was more like 33-34 cm on both and not 35.5 cm. I had to widen the thighs a few cm.Just picked up the cream dress chinos in a 48. I sized down from 50 relative to Cavour mod 3 and armoury model B trousers. The waist on the 48 rubato should be close to the 50 Cavour (ever so slightly tight on me but liveable), and the rest of the measurements on the 48 rubato are similar to slightly more relaxed than the 50 armoury 3B. Waist may be a bit of a gamble but assume I can let it out a cm or two if needed given rest of the measurements seem in line with what I like.
Happy to provide an update when they arrive in a few days.
I hope for the dress chino to match the 35,8 cm in the thighs.