My mother made our clothes when we were little. We were poor and it was the sixties.
The only sewing I've ever needed was turning up boys trousers and sewing on the odd button.
DS2 just started year 9 and still has to do D&T textiles. He hates hates hates it.
Last year there was the The Bag.
Hours spent designing and then making a bag. He wasted spent hours on it. I seldom get involved in homework unless asked, but he was almost sobbing in desperation one evening over this wretched thing. I sat down to help. After half an hour he was so grateful. Said no teacher had actually bothered to show him how to sew and he'd learned more from me in half an hour than in 2 years D&T. Even so there was no danger the teacher would suspect parental assisstance as my sewing is so bad. 
I thought that was the end of it but now he's doing it again and this time it's a hat.
He works hard at school and tries his best in every subject but he feels so strongly about the evil textiles that he wants me to;
- Ask the school to excuse him for religious reasons> Says he'd be happy to extra Maths or in fact anything else.
- Write to Michael Gove to complain.
Seriously though, I think by Year 9 they should be able to opt out of some subjects.