Sleeve length?

[The Wizard of BC]

As I said in my post the vest length is variable. I wear mine shorter than some. But most that I see today are too long as they are trying to cover the shirt with trousers worn low.

Jackets and Vests are usually sold by chest size with a very basic Short-Medium-Long body length. This is based on some 'standard' set by the company making it and is quite different among manufacturers.
This 'standard' is also based on trousers. Even kilt jackets use measurements based on a model wearing trousers as that is how most tailors are taught.

So to get a well fitting jacket and vest you would need to know more than just the chest circumference.

In general, to get a well fitting jacket and vest you will need -

Chest circumference (Taken up, under the arm pits with the arms at the sides)
Waist circumference (Taken at the largest part not the natural waist and again at the natural waist if different)
Half Back (From the spine to the shoulder seam about 8 inches down from the collar)
Crown/Cuff (Taken from the top of the sleeve seam to where the customer wishes to wear his cuff)
Back Full Length (Taken from just below the collar to the bottom of the Fell)
Back Half Length (Taken from just below the collar to the natural waist)

And Vest Back Length (take from just below the collar to the top of the waistband)

I find that most vest made to go with kilt jackets to be cut far too long. I happen to fit exactly into a 44 Regular length jacket but when I order my own vests I order them shorter than the 'standard'. i.e. if I order a Regular length jacket I order a short length vest.