Theres fashion thats not mainstream fashion.Where do you see the fashion statement? Are you talking about clothing, or the decoration at the nights and the posters and such? I don't see what you are talking about if thats so. I only hear the music and even so I do not find the link to the 90s as strong as others here. I dont hear Platifpus, Harthouse, EyeQ, Bonzai in any of the revival Trance.
Maybe some of the speed techno influence Trance is 90s feeling, ones like on Spacetraxx and UTE label, but I do not really like that. No way they are making that music for fashion. Thats the type of Trance that your parents disown you if you are a 'musician' and you show them, or the kids at school decide you isolate you ask the freak. Charlotte De Wit techno is the trendy world my friend.
Its certainly 90s inspired. Thats why you see acid/house/techno in the op text. You bring up a few of the traditional best pf trance labels, but there was more in the 90s that defined and inspired the trance genre as awhole, and if you dont hear that in the 90s revival stuff i cant help you.