My parents were very poor when growing up but did ok for themselves so we weren’t poor when I was growing up. I do however seem to have inherited some of their frugal habits:
Thermostat no higher than 18 degrees. If you’re cold put a jumper on. We all have warm slippers, bed socks, hot water bottles and blankets.
“Picnic” dinner once or twice a week, to use up anything that is about to go off.
Run older cars for years, save up and buy them outright. I currently drive a 10 year old Audi that I’ve owned for 5 years. I’m hoping to get another couple of years out of it.
Take a packed lunch and home made coffee to work. I think that saves around £5 a day each - this really adds up.
Good quality 2nd hand furniture - not mattresses, sofas or other soft furnishings but you can get some beautiful wardrobes, desks, coffee tables etc and they are from the era when these things were both built to last and designed beautifully.
2nd hand books.
Main shop at Aldi with a few bits from our local bakery and butcher.
We do treat ourselves sometimes - we’ll go out for dinner or order a nice takeaway every couple of weeks. We go on holiday twice a year 1 abroad and 1 in the U.K. I tend to buy clothes from H&M or Zara but I buy classic things that last a few years. DP likes an expensive brand of organic cider so he buys a crate (16 bottles) once a month to drink at home. The economising above pays for the treats.