My grandparents gave me a single turtleneck dickey for Christmas once. I was so confused when I opened it. I had literally never seen one before, so my first reaction was to ask, "Where's the rest of the sweater?"
Like this for those who are unfamiliar like I was! https://www.amazon.com/dp/B07MMFD2YD/ref=cm_sw_r_cp_apa_glt_fabc_DAWFCZMKR6KR1V21Q0ER?_encoding=UTF8&psc=1