M.L.
My sons are the same way... my 3 year old has to have them 'smashed' the perfect way or he will throw a terror fit and literally undress himself in the carseat.
I had sensory issues with clothing as a child, and actually still do as an adult though I'm able to tolerate it better. I would just get rid of the clothes they wont wear and give them an allowance so they can contribute to buying their own.... and not buy them anything new. Then they may be better at picking out clothes they do wear from the beginning.