occam
Hero
Devas have a similar style, where their clothing and armor tends to be flowing and in particular they frequently have some kind of mantle or pauldrons with large, golden wings framing their heads.
So from a style-guide point of view, this makes sense. Trying to give the Deva a certain look...
...but from a flavor point of view, I'm not really sure how that fits. First, I'll admit to not being positive about the background of Devas and being too lazy to actually look it up, but my understanding is that they're born on the mortal plane and relatively uncommon if not downright rare. Certainly, there are no Deva communities.
Further, their typical clothing/armor is very opulent and, crucially, very customized. So not only would the stuff be made of precious materials, but it's also got to be all custom work. It's not like Dwarven plate armor where there are generations of craftsmen making things in this particular style. It's entirely likely that any given craftsman who makes something for a Deva will only ever make that single set of clothes/armor, and never make another piece of Deva-styled stuff.
So there are two questions here.
1. Why is the style so consistent?
2. How can a Deva, just born into the world anew, without a penny to her name, afford to hire a master craftsman to create such regalia?
Player's Handbook 2 does address most of this in the deva racial description, and "Ecology of the Deva" in Dragon 374 goes deeper: the stylistic similarities, existence of common cultural elements despite the lack of a coherent society, the emphasis on custom artistic works, where and how they're reincarnated, etc.