I think it depends on your personal interpretation of "let yourself go". My mother would think I have, because I no longer wear fitted, uncomfortable clothes, heels, smart suits and the like. I would say I had let myself go if I didn't look after my body, skin, cleanliness and lifestyle. I enjoy wearing shorts, jeans and tees, barefoot shoes and sandals, leggings and the like and can throw the odd comfortable dress in when required. I'm always clean and my hair is styled. Minimal makeup finishes off my
(slightly bohemian) look. Mother would say I was scruffy though, but who cares!