It doesn't necessairly need to be "dressing up" per se. But if you're showing up to work poorly shaven, wearing stained sweatpants - you're going to be at leas

It doesn't necessairly need to be "dressing up" per se. But if you're showing up to work poorly shaven, wearing stained sweatpants - you're going to be at least a little more self concious, a little less self confident. Nobody's going to lift your mood with "hey, looking sharp!". It's going to reflect in your body language, and the body language in your peers, even if it's largely on a subconcious level. It's potentially the difference between being ready to walk to lunch, or a meeting, or an interview at a moment's notice - ready to actually tackle the work and the day - vs being ready to go to bed at a moment's notice.