50 high-quality image masks for clothing

We are looking for someone to create 50 high-quality image masks for clothing (T-shirts, tank tops, hoodies,...) photographs. We want to use the masks to change the color of the apparel in the images.

Please make sure that there is no white border remaining at the edges of the clothing item and the color doesn't bleed into the surrounding area. Some images will have hair or other objects partially obstructing the clothing item. In these areas the masks will need lots of detail so the original color does not shine through the hairs.

Some notes:
For studio photos an extra mask is required of the model so it's possible to change the background at a later stage.
For photos of hoodies the strings should NOT be part of the mask (see example image).
Please provide the images in PSD-format in original size.

Please look at the attached images to get an idea of what we want to accomplish.