How to prevent this irritation?

Ok so I have brazilian waxed before but when I do ...the day after I get tiny tiny white heads down there and I obviously stopped brazilian wax cause of it...well after I wax it I do put back on my fit undies and skinny jeans...is that the reason for irritation...what can I do for my brazilian wax to stay irritation free and smooth?
How to prevent this irritation?
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