I am blessed to have been taught to mend, darn, alter, and sew new clothes.
Me daughter got a small sewing kit in her calendar this year, the elves knew I am going to start teaching her to repair ;) Firstly buttons, easy seams etc.
The more expensive brands are often (though not always) sewn with more care and can be altered or repaired to extend their usefullness.
I used to see this, but it is not the case a lot of the time now unfortunately. It still requires checking the quality before buying, which requires knowing something about how they are made. It is not enough just to "pay more" these days and trust.
!PIZZA