nickblender

 Goal: To add a gap in between the knee pads and boots We could move the object manually to add a gap in between the knee caps and boots, but it would not make the gap consistent, instead, use the Shrinkwrap modifier. 1) Duplicate the part of the knee cap 2) Select the duplicated part 3) Press Ctrl + P, and select "Clear Parent". This is important because it prevents an error from occuring when adding the boots as parent in the Shrinkwrap modifier 4) Add a new modifier called Shrinkwrap in the duplicated part 5) Add the boots as the parent in the Shrinkwrap modifier in the duplicated object 6) Adjust the offset to a positive value to add the gap in between the knee cap and the boots. Done.

 The goal is to add crease along the middle in the garment: 1) Select the edge that you want the crease to be at 2) Go to Item tab by pressing 'N', then find Edges Data, change the value of Mean Crease

 The issue, when hitting Shift + D, the duplicate doesn't work. The solution, click on the object, either in the 3D Viewport or the Outliner, then hover the mouse cursor to the 3D Viewport, then hit Shift + D again. You will see the object being cloned.