The thing is, Dhoni says that they're the replica of his gloves that he used in the Test series. So if that is the case then it is poor from the officials point of view if they haven't caught it, i mean i'd be more worried that he'd been using gloves which were against the rules in the Tests rather than the Tri-angular series.
The thing is its one of those rules which is a bit like a batsmen calling for a runner. The rules state that the runner be wearing the exact same kit as the batsmen, therefore meaning if a right hander wanted a runner, the batsmen would have to be right handed OR wearing right handed kit, but when G.Jones asked for a runner in the Indian series last winter, Andrew Strauss took to the field wearing his kit, left handed.
You can either be quite relaxed on rules, or straight to the point, you can't be the ICC and just say no to one thing, but let another case off.