Ooh, one of the more light hearted ones...
My mum bought my bras for me as a teen. I wasn't told or taught how to measure myself so she did it. She told me what size I was.
Eventually, I was the same size as her (34B). When those bras stopped fitting me properly, she made me feel that it was because my body was wrong. It wasn't her fault or the shops' fault that those bras didn't fit me properly. It was mine.
She would tell me all the time that my boobs were small, too small and that I'd never get married or find a boyfriend because my boobs were too small. I didn't have the confidence to think I needed a bigger size because bra size (evidently) carried a value judgement for her (and therefore me) and I wasnt 'good enough' generally to need a bigger size.
So I spent hours trying on 34B bras and crying because they didn't fit. I'd spent so long being told my boobs were "too small", it didn't even occur to me to try a bigger size.
She even joked about it with her boyfriend when I was late teens that she had better/bigger boobs than me and suggested on one occasion that he see them au naturel and compare them to say whose were 'best'.
I just accepted this and that she was right (such is the nature of long term emotional abuse) and just believed I couldn't find bras to fit me because my body was the wrong shape for bras.
When I finally had my size measured properly, I was a 34DD.
She just couldn't cope with the idea that I had bigger boobs than she did.
She also told me all through my teens that I was fat and too fat. She'd buy me clothes that were too big for me which then hung badly and didn't fit properly and she told me that it was because I was so fat nothing would look good on me and it was my own fault for being fat.
I wasn't fat. I was just a different shape to her and curvy but I didn't have an ounce of fat on me in reality.
But I also spent years planning where I was going to sit in pubs, restaurants etc so that I could get to the bar/toilets easily without either a) being seen by others or b) bumping into things and sending people flying with my body. In reality, I was 8 stone by 18 and stayed that way until my mid 30s when I was 9 stone.
I just couldn't see it.