Clothing and Covering the Aurah

Q: What is the sharia ruling praying salaat with a short sleeve jubbah above the elbow?

Q: Is the salaah valid if one part of clothing was very slightly see through, but the salaah was prayed in the dark where an onlooker would never be able to notice, and the woman praying didn't even notice either? The colour of the skin was seen but only slightly to the point where it wouldn't be apparent unless one looked a little more closely (in normal lighting)?

Q: If quarter of the Awrah is exposed for less than three subhaanAllah, is the salaah valid? 

Q: Is it permissible to perform salaah with one's sleeves folded but the sleeves don't go above the elbows? Meaning the elbows are covered but the sleeves are folded.

Q: Is salaat valid if performed with a small tear in one's trouser exposing a little bit of one's thigh? Does salaat performed in this condition have to be repeated?

Q: Is it compulsory for a woman to cover her feet during Salaah?

Q: Can and imaam put on a short sleeve jubba to perform salaat in jama'ah?

Q: Can a woman only where a scarf whilst performing salaah? The hair is exposed in front?

Q: Is my salah in nike clothes valid?

Q: A woman wears a long dress and a burka while praying Salah. She is however, not wearing a trouser (her dress is long that covers her legs). Is this ok or does she have to wear a trousers also?