Clothing and Covering the Aurah

Q: If the dress or skirt of a Hanafi woman is above her ankles (i.e. the ankles and part of her shin are exposed), will her salaah be valid if she prays salaah after putting on socks to cover the exposed area?

Q: Is it mandatory or necessary for women to wear something under the gown (like to wear a shalwar or pants under a night dress) in order to perform namaaz or can she read her namaaz just wearing the gown or night dress which covers the whole body up to the feet but nothing inside. Will her namaaz be valid?

Q: If a person prays while wearing a t-shirt that has depictions of creatures on it, is his prayer valid or should he repeat it?

Q: If a person prays with his t-shirt inserted in his pants, is his prayer valid or should he repeat it?

Q: Is wearing a skull cap mandatory whilst praying Salaah?

Q: Can we perform salaah with clothes on which has animals like Puma shirts, etc.?

Q: I wear a trousers belt, it's leather. I don't know what kind of animal skin was used to make this leather belt. I heard that if you wear leather made with pig skin and if you pray salah with it, it wouldn't be accepted, it's nearly impossible to tell if the leather is pig skin or not because where you buy it, it doesn't says. Would my salah be valid? 

Q: Can we wear a leather belt in namaaz or not?

Q: Zaid has a towel ihraam which is made in such a way that there are very small holes in the ihraam cloth. When wearing the ihraam, little skin is visible from the holes. Zaid prayed salaah, did his umrah and Hajj with the above mentioned ihraam on. According to Shariah is his salaah, umrah and Hajj valid? If it isn't valid, what should be done to compensate?

Q:

1. If one prayed salaah while wearing clothes with a human picture which one missed to see and saw only after looking at them carefully, would those salaahss be valid? Does one need to repeat those salaahs?

2. What about praying salaah in clothes which have clear human/animal pictures?

3. If one prays next to or in front or behind someone wearing such clothes or wearing a work ID with visible picture of the person (around 2 inches in lenth and 2 inches in width) would the salaah be valid due to being in close proximity of a picture?