Aero B-6 Questions

[MrProper]

the one advantage the B-6 has is that it does not feel as bulky as the Irvin and gives you a bit more freedom of movement due to it's lighter construction and bi-swing back. and of course it has two front pockets...

At least for me, there is no difference between B-6 and Irvin in terms of range of motion. The B-6 has the action back, but the Irvin has the underarm gussets, which work really well.

 

[Griffon_301]

my ELC Irvins are bulkier than my ELC B-6 which is small wonder, given the difference in fleece length and construction of the jackets.
the Irvins are far from being restrictive regarding range of motion, the B-6 just feels a bit lighter and "easier" to wear. I still prefer the Irvin

 

[Kermit3D]

I might be wrong, but it seems to me that Aero Leather's B-6 has a fleece that is too thick, which is historically inaccurate.
Normally, the B-6 should have a fleece of about 1/4 inch (around 7 mm), compared to the B-3 (and probably the Irvin as well), which has a fleece of about 3/4 inch (around 20 mm).

Feel free to correct me if I'm mistaken.