Is the first row of buttons on a double breasted jacket functional

Double-Breasted Suits & Jackets Guide

Why is it hard to find brand new three or four buttons front of a suit jacket these days? - Quora

What is the origin of buttons on men's jacket cuffs? I can't see a function for them. - Quora

Why do jackets (and other garments) always come with extra buttons? - Quora

Variations on the Double-Breasted Jacket: Buttons, Wrap and Lapel

Why do suit jackets have fake pockets? - Quora

Suit Jacket Button Closure Rules You Should Know

Elements of a Bespoke Suit: The Cut, The Single or Double Breasted

Three ways to wear double-breasted with Gentlemanualen

Double-Breasted Suits & Jackets Guide