Wearing semi transparent clothing

Q:  Some of my clothes are only see-through when looked at closely. The skin can only be seen underneath if there is enough light and if I look very closely but to an onlooker from afar, they would not be able to see my skin. Am I allowed to wear such clothes during Namaaz, which are opaque and not transparent but only see-through from a near distance?

Repentance

Q: I would like to ask the following question on repentance

1. Does repentance wipe out previous sins?

2. Am I always obliged to confess to the one whom I've wronged even if this might bring severe enmity?

3. How do I feel regret during repenting?