I have encountered two problems with cashmere garments sold nowadays. The first is that although the wool is from the Kashmir goat, it is not always the bit from the underside that is used, so quite a bit of modern cashmere clothes are simply not as soft as they should be. The second is that, in another attempt at mass production, knitted cashmere material is made on machines, then garment pieces are cut out and sewn together as one would with cotton favric, instead of each piece being knitted separately. Garments made this way are more likely to come apart and if they do, the fabric starts to unravel. Properly made, this wouldn't happen.
I paid over a hundred pounds for a cashmere jumper from Orvis a couple of years ago but had to send it back for a refund because that's exactly what happened. The fabric also started to 'pill'. Good cashmere does not pill. I have a Lands End cashmere sweater that's about twenty years old which has never pilled and never come apart at the seams.
So what I'm saying is check your cashmere carefully. In particular look at shoulder and neck finishes. You can usually tell if a neck finish has been sewn on or knitted on. If the former, it's cheap skate cashmere best avoided. They'll still try to charge top prices for it though to kid you into thinking it's best quality just because it's from a Kashmir goat.