I own Aldens on the Barrie last and Trubalance last, both in 8.5D and both seem to fit me well. But I'm still curious how I should size for other lasts? The same or differently?
One of the problems of giving this type of advise is that it really varies between people with high arches, tall insteps, etc...
For example, I wear 9.5D in Barrie, could go down to 9D in Tru-balance, 9.5 D or E in Hampton / Aberdeen - I also own 10D in Hampton and Leydon.