Short Pants
Question :

Can a mature man wear short pants (up to his knees or a little above), in public?

Answer :

It is not part of the pubic area that men should cover when they are in public unless such a thing subjects the person to be humiliated then it becomes prohibited.

Red Clothes
Question :

Is it permissible for Shias to wear red clothes if they live in Iraq or Iran?

Answer :

It is permissible to wear red clothes, but it could be in some cases unfamiliar to the society, so whoever wears red clothes could subject himself to embarrassment or humiliation.

Silk Tie
Question :

If my tie is made of silk, is it permissible to wear it if it is not directly touching my body? (It is over my shirt)

Answer :

It is prohibited to wear if it was from pure silk. Based on compulsory precaution, it should not been worn during the prayer and the prayer is void then.