I just had to share this amazing video I found: https://www.youtube.com/watch?v=hG0YssaRzls OK, so it’s for maternity jeans, but it will actually turn any uncomfortably tight jeans into a wonderfully comfy pair, with a soft, roll-down waistband. A waistband that can expand and contract with you! All you need is the offending jeans and an old top.
You just cut off the waistband and belt loops of your old jeans and the shoulders/ arms off your top. Then join the two together – et voila! I found it a nightmare to try and unpick the belt loops, so I did cut them off which left small holes. I just darned mine, but you could also just cut an extra centimetre or two off the waist so that you don’t need to worry.
I just made a pair with some jeans I was going to give to the charity shop because they weren’t a great fit, with a really low waistband and a slightly worn vest top which was too tight under the arms. So, these are basically free, new trousers and it only took me about 30 minutes from start to finish!