A clean and neat hoodie, while still very casual, is perfectly respectable and a zip-up sweater is a step up again, especially if you wear a button-down shirt under it
Shirt: A colorful trucker jacket topped over a graphic undershirt, giving the topwear cheerful tones
over time, the two would gradually become outerwear, with the kosode eventually developing into the modern-day kimono
Taste and add a bit more salt and/or pepper if needed
Most gala invitations will specify the level of formality expected, but even if they dont, knowing the basic tiers will guide your choices and help you make an entrance that feels appropriate and elegant
The more accurate they are, the higher the chances they will have of selling that outfit to said customer (and getting money in return)