SINCE angels are people and live together the way people on earth do, they have clothes and homes and a great many other things: the difference, however, being that everything is more perfect for them because they are in a more perfect state. For just as angelic wisdom surpasses our wisdom so greatly as to be inexpressible, so too does everything that comes to their perception and sight, since everything perceived by and apparent to angels corresponds to their wisdom (see above, Section 173).
Like everything else, the clothes angels wear correspond, and since they do correspond they truly exist (see above, Section 175). Their clothes reflect their intelligence, so all the people in heaven are dressed according to their intelligence; and since one will surpass another in intelligence (see Sections 43 and 128), one will have better quality clothing than another. The most intelligent wear clothes that gleam as though aflame, some radiant as though alight. The less intelligent wear pure white and soft white clothes that do not shine, and those still less intelligent wear clothes of various colors. The angels of the inmost heaven, though, are naked.
from Heaven and Hell, Sections 177, 178