"A Different Day" is about the gap between how the speaker usually feels about their body and how they feel on one particular day. Most days, they cover up in hoodies and sweatpants and list the parts of themselves they dislike: legs, arms, stomach, face. Then the poem repeats that same list, but flips it. Today they love every one of those parts, and they show it by wearing a skirt and a tank top.
The repetition is the clever part. Hearing the same words twice, first with hate and then with love, makes the change feel real and personal. The mood is quietly hopeful, but not naive. The speaker admits they might hate their body again tomorrow. Rather than pretending the good feeling will last, they simply claim it for today. That honesty makes the ending feel brave and gentle, a small moment of self-acceptance that doesn't need to be permanent to matter.