I don’t have much to add except commiserations on the expensive and sub-par items. And I think Liz asks a some great questions. I wish we had answers.
Like Sal and others, the items that tend to wear out, fade, pill, or shrink too fast in my closet are knits. I try to go with trusted brands and/ or buy on sale so that I don’t feel as disappointed when they wear out quicker than I might wish. Fabric composition plays a role — cotton knits can stretch or fade, cashmere can and does pill, merino sometimes shrinks even with careful washing.
For the rest, it is hit or miss. It does not seem to matter whether the item is high end or low. I have 10 year old items from Zara that still look new and items a year or two old that wrinkle like crazy or won’t stay hemmed. Same is true for some things at much higher price points.
I will return items ordered online that look or feel cheap in person. Pronto. I rarely write a complaining review but I have called customer service at various times and usually get a satisfactory result.
Mr Suz is a pro at that. He will always call and ensures he isn’t charged for returns if the item is sub par. He could turn this into a side business, he is do good at it!