I honestly find wearing the same outfit on “work” days really helpful with just black skinny jeans, and a black shirt, and layering it with a black jacket. It really makes it just makes life easier in the sense of not having to make a decision on what to wear that day, however it’s still nice to “dress up” and wear something different on days that you know there won’t be as much stress. Ya I might save some “mental energy”, but to be honest it’s just easy to do and automates another aspect of my life that I don’t have to worry about. I took the approach also instead to buy just one color of clothing (black) so it’s never hard to match anything and it all works together, and of course you always have the option to vary shoes so I do that as well, so I guess it’s almost the same outfit everyday. It takes less than 2 minutes to get dressed if you only have one color, but of course it’s not for everyone, and some can find it robotic. It personally works for me, and let’s me get ready quickly without having to worry about appearance because the I know this outfit works on me.