I'm fat, but I view in my eye that I'm 100 lbs lighter than I am. Seeing myself in the context of reflection that aren't mirror, I can see my fingers are much more plump than I seem to physically see.
This has been happening for around 5 years, so I understand better how you can be so delusional as to see yourself as a perfect woman even when you have 5 o'clock shadow. I'm not even delusional, I know I'm fat, and yet I do not see the extent of my weight.