I never used to until i bought a pair of pj pants one time, and i was wearing them and realized they reaked of formalihyde!! Then it clicked that i had read and email once about vicky secrets using formaldihyde in something in their bras. so now i wash evreything first, cuz it kinda freaks me out. I especially wash my kids' stuff. theyre skin is a lot mroe sensitive than mine! Tho it is a hassle!