I guess you could make sure it's not something other than a sensory issue? Have you recently changed your laundry detergent or started using a new skin product? Perhaps switch to sensitive skin products and use a mild moisturiser after you wash as dry skin can cause itching.
If it's definitely sensory then use a process of elimination to work out what materials in particular are bothering you or if it's seams then try for seam free clothing. Looser fitting items might also be better. Unfortunately I don't think there's much else you can do.
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Diagnosed ASD Aug 2016, confirmed Dec 2016.
Also have OCD and various 'issues'.