When I was going through a REALLY rough period of self-loathing due to weight gain and shitty body image, I vividly remember sitting in the shower with my partner in the dark, expressing my feelings of disgust I felt when I looked at myself in the mirror. He wasn't really saying anything and I sort of called him out on it, asking for some kind of feedback or support.
He very quietly said "I don't really know what to say. I tell you you're beautiful all the time and hearing you talk like this makes it feel like you don't really believe me" I'm not 100% sure, but I think his voiced cracked like he was getting emotional.
That made EVERYTHING shift around me and I felt AWFUL for centering my misery and not even considering that there was another party involved in my relationship with my body and my self-image. I wasn't letting his love in. I wasn't intentionally disbelieving him, but I WAS doing it.
From that moment on I promised him to believe him when I asked him about my appearance. It's made a MASSIVE difference in my self-confidence. If I'm not sure about an outfit, I just ask him "Do you think this looks good?" And if he says yes, I say "okay!" And then I don't think about it beyond that.
I'm not saying "your opinion about your body doesn't matter, just ignore it and listen to other people's opinions instead." I'm saying you can't see yourself the way the people who love you do. Your partner(s), your friends, your siblings, etc. The people we love and surround ourselves with become a mirror that reflects the most-adored parts of us that we can't otherwise see.
It's only fair that we believe them to be honest with us when they express that love. Your friend isn't just placating you when she says you look amazing in that outfit. Believe her.
I didn't realize until that moment in the shower that I could choose to believe my partner and take away so many doubts and fears. I no longer spend all day fussing with my outfit and worrying about how a garment sits. I choose to believe that when he says I look great, I do in fact look great and I don't need to care beyond that.
This isn't exactly what OP's Twitter post is addressing, but I think it's deeply related. Believe that you are lovable and allow the love of those around you to shape how you see yourself.