There are a lot ways ways to do this but the most simple ways is using hue and saturation, to do this, select your cloak, then click Image> adjustments> hue and saturation. And play around with the colors. Make sure you are selected to the cloak layer. Also don't forget to check the small box Colorize.
You can also use the color replacement tool, just right click the brush tool icon and use color replacement tool. Set the mode to normal, Limits to Discontigous. Then choose yellow as your foreground color.