What's the visible difference between flap pockets and welt

THE DIFFERENT TYPES OF SUIT JACKET POCKETS AND HOW TO CHOOSE

How to Sew: Double Welt Flap Pockets in 10 Easy Steps – pattern

What's the purpose of the pocket behind the lapel of a suit? (Not referring to the breast pockets) - Quora

What are the types of pockets of jackets? - Quora

How To Sew A Welt Pocket (or Creating Suit Jacket Pockets) (Ep. 39

The Different Types of Suit Pockets — How To Choose Yours

Pockets - Visual Dictionary

Why are there no pockets on doctors' white coats? - Quora

The guide to jacket pockets – Permanent Style