Going out for dinner is my favourite thing to get dressed for. It is also an under-curated outfit category. Going out to eat is a much more regular occurrence, for most grownups, than going to a wedding or to a fancy party, but we spend a lot more time talking about wedding-guest outfits and party dresses than we do about what to wear to a restaurant.
I don’t think it’s because what we wear to go out isn’t a big deal – restaurants are expensive, and dinner out is a big treat for most of us. You are investing a substantial amount of money, and probably most of your Friday night, in this occasion. But there is no dress code, so it doesn’t feel stressful, which I guess is why we don’t feel the need to plan it.