It IS a huge step, and I’m very happy for you. My one piece of advice is not to race ahead of yourself and instead continue to seek/accept her cues on the matter. We tend to want to take a mile when we’ve been given an inch, and doing so can actually end up pushing us backwards.
Speaking from experience, my wife was very accepting and encouraging of my dressing for about 5 years starting in ‘04. I believe part of the reason I stopped dressing for 11 years and purged — all at her … um … urging — was because I sometimes attributed macro acceptance/encouragement to things that were mere micro acceptance/encouragement and unwittingly blew through some boundaries believing they no longer existed. So I counsel cautious optimism! 😊