The shirt sleeves are too long. The jacket itself might not have length problems. Still, it looks bad, at the shoulders, the top button, etc., and it's wrinkled for some reason. The pants look too long. The worst thing is the cut - everything emphasizes long and thin. The next suit needs to fit looser in the body and limbs.
Not tan. Not a versatile footwear color and not traditionally an evening color. Also, in a casual environment like a bar, it could easily get discolored.
That leaves black and mahogany. The former would be iffy with navy chinos, which are limited in usefulness anyway. Those two dark colors probably would not look right with light-colored pants. In other words, there's a need for a different pair of quality footwear to wear with some of the items. One shouldn't have just a...
That's getting warmer, figuratively. These discussions never cite the existence of lightweight underwear. There are even differences among boxers, which let's hope he wears something similar to. Socks make a difference, also - lightweight mostly cotton socks probably are best for the situation.
If they're neither green nor very formal (which just wouldn't work), then the decision should be based on the pants and shirt. For example, if tattersall shirt and brown pants, wear the navy sneakers. By the way, more shoes are needed.