Lynne, Strangely enough, I had a similar problem this weekend, last term I bought 2 pairs of the school suppliers trousers for Amber. One pair s zip went completely within 2 weeks and last week, the other pair split around her nether regions. I went to buy her some new ones on Saturday and faced with the same rubbish choice as you outlined, I plumped, like you, for black cotton jeans..........We'll see how long it takes before she gets rumbled!
It is a crazy world!
Cheers, Lucy