The British say "Her hair is in a plait" (picture 1) but "Her hair is in pigtails" (picture 2).
Americans say "Her hair is in a braid" (No.1) and "Her hair is in braids" (No.2).
I love the word "pigtail" because it sounds very cute but I am not sure if it is OK to say "Her hair is in a pigtail" (No.1).
Can we say "*Her hair is in a pigtail" instead of "*Her hair is in a plait" in British English?