After playing with it for a few hours I think this is a great product, with a very reasonable asking price. Thank you!
As stated there are thousands of possible combination, and I managed to get around most of the small issues, like different clothing items not lining up, and even managed to create the feeling of different body types by playing a little with the dimensions using GIMP. However, the most obvious limitation from my point of view is that there's only one pose for the busts. This will get noticeable for most players after spending a few hours playing a game made with these assets, and for most non artist game makers, it's not something that's easy to fix with an image editing software. I think even one additional pose can go a very long way in making the characters feel unique and diverse, and not just generics made with an engine. I know you are planning different body types, I hope that they come with different poses as well, and that we could have at least one additional pose in the near future.
Again, overall it's a great product!