A broad- or narrow-necked scarf knotted so that it ends in a pair of wide-tipped "tails".
Ascots were a craze in the 1960's, which can be seen in the orange one that Fred Jones of Scooby-Doo wears. Hakurei Reimu and Flandre Scarlet from the Touhou series are also usually seen wearing an ascot as well.
The following tags implicate this tag: frilled_ascot (learn more).