Leather straps used in falconry to "bind the legs of birds of prey":[https://en.wikipedia.org/wiki/Falconry_training_and_technique#Equipment] until they are meant to be released on a hunt.  

[[kasuga maru (kancolle)|Kasuga Maru]] and her [[taiyou (kancolle)|Taiyou]] form notably hold a Mitsubishi [[A5M]] via jesses.
jesses