What do these clothes measurements mean?

So I got fitted for a tux last month. It fit great. I want to buy clothes with those measurements, but I don’t know what the measurements mean.

Chest: 42
Overarm: 50
Coatsleeve: 16
Waist: 34 (I think this is the only one I understand)
hips: 44
outseam 41
Shirt: 16½×35 ( i think the 16.5 is my neck, what is the 35?)

My question:

When going to buy regular retail clothes, what the hell do I buy?

Thanks!