"Uchiki (=robe)" is worn over "hitoe."
A red "hakama" is worn and a white "kosode" is worn under "hitoe."
This "uchiki" for summer season is made of "kenmonshaji" (=dress material).
" At the time of intense heat in summer, only a piece of "hitoe" might be worn, or some pieces might be worn in layers without "uchiki."