It's unlikely that members of the Japanese imperial family wore commoner type kimonos in historical times. Formal imperial garb didn't change much from the 10th century on. The most formal for a lady would be the multi-layer dress called the junihitoe. They might be available as expensive wedding rental gowns these days.
This isn't easy to recreate, so you need to improvise something easier. If you think a crown and tiara might do it, what's on the heads of traditional hinaningyo dolls are pretty much what the emperor and empress would have worn.
Everyone does wear a type of clothing.
what type of clothing do FBI wear
what kind of clothing did the Pawnee wear
American clothing.
light clothing
i think they wear silk
normal clothing, modern clothing, traditional clothing
scrubs
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Skirts
The Atakapa people typically wore minimal clothing made from animal skins and plant fibers. Men often wore loincloths and women wore skirts or dresses, with both genders commonly adorned with beads, shells, and feathers for decoration. Due to the hot and humid climate of their region, clothing was kept simple and lightweight.
silks