Having legs etc. waxed in a salon (did my own for many years after starting family, eventually saved up and got lasered!)
Getting roots done at hairdresser, started to do it myself, very badly, soon gave up on being blonde and went back to natural colour.
With both things could not afford it. Even when I could again I couldn't justify the expense.
Also would go up to a year sometimes without buying any new clothing and when I did it was from Tesco or Asda.
Used to get taxis a lot. Once I'd had baby just had to be more organised and walk everywhere. I used to walk miles every day with my first baby.
Holidays ... with each child did not have a holiday for three years. (First one couldn't afford it. Second one was a terror and couldn't face it, lol!)
Eating out. If we paid a babysitter we couldn't have afforded the dinner. Occasionally would go out with baby but it was tea and cake only!
I was/am a solicitor and the most annoying thing was people assuming I must be rolling in it and living the life of riley. Unfortunately once we'd paid mortgage, nursery fees and bills, I had £15 a week "spending money".
There are 10 years between my two children and finances were part of the reason for that. Much much easier financially the second time around.
Things are better now thank goodness but it's hard to shake off my "learned frugality". Maybe not a bad thing!