I struggle with buying new things even when my stuff is dead dead, but less from a 'fix it up' sense and more from a 'going outside is hard and money is terrifying, so I'm just gonna not wear that torn tshirt and I'll fix it eventually' kinda deal, but then I don't fix it because I'm disabled and even existing takes too much energy. My supply of actually wearable clothes is at an all time low :'D
I did have the very stereotypical 'fell over in jeans, scraped my knee up real bad and tore the fabric' thing a while back though, and I covered it in a bit of fabric and embroidered a really cool flower over it. Still one of my favourite pieces of clothing.
Visible mends and adding to clothes makes me feel really good... but I only tend to do them when it feels like there's a story behind it. Clothes just being 10 years old? ehh, even if I fix them they'll just tear again later.
And then I don't buy more clothes. Why do I do this to myself.