For the next step you will need to enhance the Dark tones of the Boot.
KEEP in mind the use of REF Photos goes without saying. Here are the main Ref pics I'm using for this thread.
Notice how Dark the boot actually is compared to the Spat or Jumpsuit.

[ATTACH=full]4810[/ATTACH]
[ATTACH=full]4811[/ATTACH]
[ATTACH=full]4812[/ATTACH]