russianfolklore:

Women in traditional russian headdress – kokoshnik.

The kokoshniks
primarily worn in the northern regions of Russia in the 16th to 19th centuries.

The word kokoshnik first appears in 16th-century documents, and comes from the Old Slavic kokosh, which means a hen or a cockerel.
However, the earliest head-dress pieces of the similar type (rigid
cylindrical hat which completely covered the hair) have been found in
the 10th- to 12th-century burials in Veliky Novgorod.