Joe Tomei here. A student of mine had a baito as a miko-san , which is one of the assistants at a jinja, selling hamaya during shogatsu. (trans “part-time job at a Japanese temple as a ‘shrine maiden’, selling ceremonial arrows to ward of bad luck for the New Year’s festivities”). This isn’t about how to get a baito at a jinja, but I hope that sentence may interest you in this guide to Shinto vestments. Links below on other aspects of Shinto shrines are also interesting.

http://www.nippon.com/en/views/b05212/