On Good Friday:
Matthew 27:28 They (the soldiers) stripped off his clothes and threw a scarlet military cloak about him.
Mark 15:17 They clothed him in purple and, weaving a crown of thorns, placed it on him.
John 19:2 And the soldiers wove a crown out of thorns and placed it on his head, and clothed him in a purple cloak
Why is one gospel account that Jesus has a scarlet cloak and two other accounts mention a purple cloak?