thisfits:

How to Fit a Suit Jacket - How to Fit Mens Pants - Esquire

A very reasonable guide.
With jackets, you should also note whether the lapel is flush against  your shirt, and whether the back covers your rear end.  Sleeve length  as well, of course, but that is alterable.

thisfits:

How to Fit a Suit Jacket - How to Fit Mens Pants - Esquire

A very reasonable guide.

With jackets, you should also note whether the lapel is flush against your shirt, and whether the back covers your rear end.  Sleeve length as well, of course, but that is alterable.