Like others, I would not even be looking at a top priced in that category. I buy the majority of my clothing from charity shops. Items are always washed or dry cleaned by me and I do check for wear and tear.....even the sorting ladies can miss the odd defect! Check buttons, zips etc. I also buy items for my home. Admittedly, you have to be prepared to do an amount of wandering round, but most towns have a plethora of charity shops....and coffee shops for that sit down and a cuppa. I enjoy the 'hunt'.
At the moment you CANNOT try on an item of clothing, but if you have only paid £2 or £3 or even something off the many £1 rails that appear, then you can just re-donate. Shops are allowing you to ask for a refund (I believe... but not sure) within a certain time. The pandemic has channged so many things so its worth asking at each shop what the rules are.
I'm horrified at the prices charged in retail stores for clothing. If you have to have something special for a one off event, it makes sensje to pay as little as possible for it?
A lot of charity shops keep clothing on a separate rail for special occasions. Cocktail dresses, sequinned tops, wedding dresses etc. Just ask if you can't see what you are looking for. Staff are generally friendly and helpful and will go into the back area to check for you.