Here are some examples:
This is my friend and me before we were watching a musical in Austria.
This is Cassie and me in a theatre in England. You can't really see what I was wearing but I basically wore a long sleeved shirt, jeans and a scarf.
I think you can all see the differences now..
The first time when my mum and I went to a theatre in London we were a bit shocked!! Because people were walking into the auditorium with some shopping bags, food/snacks, wine (!!) and most of the people wore trainers and daily clothes. We both looked at each other and were like "what the hell are they wearing?!" We couldn't really believe what we saw...
...I think you can compare it a bit with our "we are going to the cinema" - outfit.
The last time I was in London I went to the theatre with a friend, who lives in London and my question to her was: "You know, what still really confuses me?...why are they all going to the theatre with normal/daily clothes on?" And my friend had actually a really good point. At first she also had to get used to it, because she is from Scotland and in her hometown they usually also wear dresses or nice clothes to the theatre. She explained to me that in England, or especially in London it is such an everyday thing you can do, because they have so many theatres and nowadays it is really easy to get some cheap tickets. Like we did on that night...on the same morning we just looked online and were searching for some good, but cheap tickets...and only after about five minutes we found some!
On the other hand in Austria it is not as easy as that, I mean I'm sure you can get tickets on the same day but I am pretty sure that they would be very expensive. Normally when my family and I are going to the theatre we book our tickets at least a month before.
I think it will always be a bit weird for me when I see the other people with some shopping bags or snacks in a theatre in England, because for me it's normal when I go to a theatre in Austria, it means I have to put on some nice clothes, pretty jewellery, lovely shoes and some make up :)