The word 'practical' is used quite a few times. This looks like it would do about as much good as bikini armour, all the intricately filigreed cutout parts over your vitals and guts would be remarkably weak.
What longbows were effective at was taking down horses and forcing your enemies to slog a long way on foot with their visors down (restricting vision and breathing). Making the fight a lot easier for your guys.
The end of armour really only came along with gunpowder weapons. Incidentally, gunpowder weapons also made longbows obsolete- largely due to the difference in training needed to shoot a gun (a few weeks on how to load) vs shooting a 100-pound warbow (years to develop muscles).