Clothing and Covering the Aurah

Q: Is namaaz makruh if the jubba does not cover the elbows?

Q: Someone told me that it is a sin to fold the pants above the ankles before performing salaah, and it is better to let the pants hang below the ankles. He mentioned that there is a hadith of Rasulullah (sallallahu alaihi wasallam) that prohibits folding the garments in salaah. Is this correct?

Q:

1. Is it permissible for a man to wear short sleeves while reading salaah?

2. Is it permissible for a man to read salaah without wearing a topi?

3. Is it permissible for a man to read salaah without a kurta?

Q: Is salaah valid if a person is wearing clothes that are slightly visible (by this I mean like normally every clothes has a slight visibility in it and white clothes which are also slightly visible) not absolutely clear? 

Q: Is Salaah valid if a man reads in a tight fitting outfit?

Q:

1. What is the status of Salaah performed with short sleeves (shirts/kurtas)?

2. What is the reason for it being makrooh?

I heard that Nabi (Sallallahu Alayhi Wasallam's) under arm or to the effect became visible while in salaah due to the sleeves being broad or wide. The portion above the elbow became visible as with short sleeves.

Q: I have a thobe that is just above my ankles when walking normally. However when I bend down or go in to ruku, the thobe covers my ankles. Is it permissible to wear such a thobe?

Q: What is the ruling regarding performing salaah with short sleeves or a T-Shirt? 

Q: Should one fold his pants in order to expose his ankles at the time of Salaah?