Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
There are many clothes made from pig skin. You may able to find out by reading the label on clothes or asking competent institutions. As for the ruling of wearing clothes made from leather of dead (unslaughtered) animals including the pig, there is a disagreement of scholars over it. But, we believe that the most preponderant opinion on this issue is that such clothes become pure after being tanned. The evidence for this is the Hadith reported by Muslim from Ibn Abbas that the Prophet (Sallallahu Alaihi wa Sallam) said: "If the skin is tanned, it becomes pure." In another narration from the Sunan books: "Any skin that gets tanned becomes pure."
All these Hadith terms indicate general ruling. So there is no objection to benefiting from the skin of the pig after tanning it. It is more appropriate for a person not to wear it or use it, as many people of knowledge are of the view that it is impure.
Allah knows best.