What are some Best Camera Settings for Recording for Chroma Keying and which color of cloth reflects least green color? I am recording footage for my music video and I am using chroma keying for eliminating the green screen and changing the background of my video. 
I am using After Effects CC 14 video production/editing software. I don't have any third party plugin to remove the green screen background and so I am using Keylight 1.2. The steps that I am following for changing the background can be found in this tutorial.

My questions about the issues which I am getting here are as follows:


The main problem I am getting here is that when I am removing the background using Keylight 1.2, I am getting white light borders on the body of the subject. These borders keep coming after the edit even while I am recording the footage from even different cameras. 
The second problem is, after creating the garbage matte and editing the clip at different levels as shown in the above-mentioned tutorial, some parts of the elbow of the subject/model are also becoming transparent. I cannot understand why.
Which color will be the best for my subject/model to wear during the shoot, so that it does not reflect the green color and will have the least reflection.
What will be some best camera settings for recording the footage in order to remove the green screen? My Camera is Nikon D5300 and the lens which I am using with it is 18-55MM.


As an example, you may get my test videos here.
Lighting is the biggest factor in improving this setup.  Move the subject further away from the sheet, use a lens that has a shallow depth of field so that any imperfections in the sheet are harder to see.  Light the sheet and the subject using diffuse lighting - large soft lights, or bright lights shone through large soft sheets, to make as few shadows as possible.  Backlight the subject slightly to get separation from the green screen and to reduce spill.

Camera-wise, use a camera which records as much colour depth as possible, and doesn't subsample the colour.  (Don't know how the Nikon samples colour)

If you're using After Effects, this is a very useful tutorial to get a good clean key, but without doing the steps above, you may still have difficulty getting a good key.