Use your magic wand tool to select (in this case a coat). You can do this by double clicking the wand on the coat. You will see the outline of your selection. You can expand or contract the selection by making the number in the TOLERANCE box at the top of your screen. I used 30 for this selection. Don't worry you can always change it back, or if things get really ugly you can DESELECT under the SELECT menu. Mac users can hit Command d and start again. Your coat should look like this.
|Jacket is selected.|
|Replace colour menu.|
Now you can play around with it using this part of the menu. You will see the colours change as you drag the HUE slider. If you don't then increase the LIGHTNESS slider.
|Change the colour here.|
When you are happy hit OK. The box will disappear and then you can deselect the coat.
Good luck and any questions or comment are appreciated and answered.
Vintage photo from Quaddles.