THE LOOK Stick-straight and long HOW-TO Wash with anti-frizz shampoo and conditioner. Blow-dry hair and use a flat iron on one-inch sections of hair. Finish with a smoothing serum. INSIDER TRICK To save time, wash your hair at night, skip blow-drying, then flat iron in the morning. BUY ONLINE NOW Davines LOVE Smoothing Shampoo, $15; folica.com and Conditioner, $17.50; folica.com.