In later times, since the way of dancing looked too violent, she danced without a "tate-eboshi" cap and a long sword in some cases.
"Genpei Seisuiki, "the chronicle of Genji-and-the-Heike rise and fall, and and "Gikei (ca 1400-1450)" the chronicle of Minamoto no Yoshitsune, describes that Shizuka-gozen arranged her hair excluding a "eboshi," a formal headgear for court nobles, and she wore a white hakama.
Although the time "Gikeiki" was written in the Nanbokucho (=Nothern and Southern Courts) period (1337-1392) is rather new, it still made a good reference to the costume.