Sir Black Tea
????
I don't see how this is being "revisionist history" or any cause for offense at all, seeing as both bases can now wear the item.
That would perhaps be a valid point if it weren't for the whole 'these looks were hot back in the day' bit. Gaia is explicitly saying that 'back in the day' (presumably mid 04 if I'm not mistaken?) avatars wore the outfits seen in the 10th anniversary Gaia-tans.
It isn't cause for offense but it IS an error and/or attempt at revisionist history on Gaia's part. It certainly is NOT sexism though.