Interesting discussion! And more interesting in the Europe vs. US angle. For myself, this is a creative outlet and I don't generally repeat full outfits period, let alone back-to-back. But It's not an issue of being seen wearing the same thing, that actually doesn't bother me in the least. In fact, among friends and here on YLF I always enjoy hearing that others enjoy seeing how I've styled the same piece -- I take "I love seeing how you've styled that this time" as a great compliment. It's more an issue of having too many ideas to try and not enough days! I think I could drastically minimize my wardrobe, meaning far more repeats, and be happy with it BUT I am certainly happier with more options to be more creative with. As far as repeating items back-to-back, the only thing I don't like to do that with is shoes. I like to let those air out a day between wears, although if I've only worn them for a very short period on the weekend sometimes I'll wear a pair again the next day for another short outing. I tend to view my outfits as a weekly arc, and I've got enough clothing that I don't often duplicate in one week although I will. I'm much more inclined to repeat on the weekends, since work wear is my experimental time and weekends are far more practical and limited.
An additional thought: It feels like women are expected to change outfits more often than men. This is something I've discussed with my husband, and we've decided that in addition to that, women also generally have more dressiness levels than men. For example, my husband primarily wears nice jeans, high quality leather boots, and a perfectly fitting button-up shirt (his are bespoke). This takes him from yard work, to eating at most restaurants, to a casual outing with friends, to visiting his parents, to work, to a ballgame, etc. I don't know that there is a single outfit that can achieve that wide a range of activities for me.
EDIT: And one more additional thought: Taking and posting outfit photos daily probably skews this as well. I've been doing it for a very long time (many years now), long enough that I am not sure whether or not I'd be more inclined to repeat full outfits if I wasn't doing it. My hunch is no, because last year when I was away from YLF, even though I took photos without the intent of sharing, I still didn't repeat outfits. It was the same as when I am sharing the photos. I may have repeated items more frequently though, not sure.