To change legs color you need to use Roster Editor, and since we don't have one for 2K14 yet, use tool called NBA 2K14 Simple Trainer.
How to use it:
1. Download the tool:
http://www27.zippyshare.com/view.jsp?lo ... y=218987392. Run NBA 2k14, go to roster, find Tim Duncan and choose Edit Player.
3. Minimize the game and open the tool.
4. It's Chinese but here's a translation:

5. To achieve the effect as you can see on my screenshots, it should be like that:

In body type choose the ninth value from the bottom.
6. Click on Save 1 button.
7. Return to the game, press Enter and save changes of editing Tim Duncan. Done.