Sometimes artist's make little tweaks to costumes. I haven't read these issues, but it's consistent in the examples you've shown, so I'm guessing he simply likes it better that way? It's a very minor detail to fuss over, considering what else is out there, being labeled "art". I thought the clear colour divide on the hand in the first image looked rather striking.
Frazer Irving's gloomy and... peculiar art style is certainly not suited for every title and every taste, but generally, I'd count him among the good comic book artists. His Klarion, for example, was excellent.