Cheongsachorong (청사초롱) are traditional lanterns, originally used for weddings in Korea.
They are made of red and blue silk.
Cheongsachorong By Minseong Kim (Own work) [CC BY-SA 4.0 (http://creativecommons.org/licenses/by-sa/4.0)], via Wikimedia Commons
Where can I buy an authentic version of these - ideally in Seoul, or elsewhere in Korea?