Round us there is a noticeable difference in the quality of the donations in certain age brackets since vinted etc. took off.
Not so much in the older lady and older mens clothes but definitely in the children's and younger womens clothes. There are still plenty of nice clothes for the more mature woman or man, but there is barely any Zara, whistles, Oliver bonas ect in decent quality (the odd bit there is is faded/ well worn/ gone out of shape). Most of the women's clothes are supermarket brands or primark.
Same with baby clothes, barely any baby gap, JoJo mamam, frugi, blade and rose ect even very little m&s, John lewis and next unless they are very well worn or heavily stained. It's mainly supermarket or primark clothes.
I've given up going in as many are selling supermarket clothes at nearly new price. This is what is killing the shops, too high price for "low perceived quality" donations which means there isn't the stock turn over and so then it goes a bit stale. The only one I visit regularly is an independent and sells almost everything for under £10. Children's clothes are usually 20p -£2 max, women and mens clothes are usually £3-10 max. Brick a brack can be anywhere from 10p - £10 and some odd bits are over. They are always busy and always have lots of turnover of stock.
There is also the growing frustration of how little of the money is going to the actual cause in certain charities.
The top and bottom of charity shopping is that 98% of customers are looking for a bargain. It is not a bargain to buy a child's Asda George brand top and bottoms for £4, when you know that it was in a 5 pack of top and bottoms for £12 last summer. However that same top and bottoms for 50p is a bargain. Vinted and other selling sites give customers bargains and at the moment are full of the decent stuff that used to go to charity shops and the seller is getting the money. With times as hard as they are for many, if you can flog bits in your wardrobe on vinted then it's a winner for a bit of extra cash.