I bought some of your £6.00 a pair knickers - there was a deal so it turned out 3 pairs and 4th for free. I washed before wearing and after - one pair the looped ‘lace’ around the leg started to come away. I washed another pair for the third time and the lace started to unravel. In comparison I have some knickers I bought in the USA when I lived there, they are minimum 3 years old and some a lot old. They are fine - I was replacing some which had become too small but I am still wearing. The top photo shows the USA underwear after at least 3 years. The second shows M&S after 3rd wash! Also, I bought a hoodie a few months ago and that started to bobble after the first wash!! I can’t believe how the quality of M&S has gone down so much. I used to rely on them and their good quality - no longer. As you don’t do petite sizes either, I shall no longer be shopping there.