Last season, a trend emerged among the fashion set: Women were leaving their hair tucked into turtleneck sweaters. It sounds so simple it's almost ridiculous, but it looked really, really chic.

And this anyone-can-do-it hair trend is sticking around: Designers and hairstylists took the "cool girl tuck" and reimagined it for fall 2016.

At Vera Wang, hairstylist Paul Hanlon used Pai-Shau Biphasic Infusion to create smooth hair with a few small braids hidden underneath. The models came down the runway with the hair tucked into the clothes or under straps on the backs of jackets.

At Alice and Olivia and Public School, the tuck was emulated with a voluminous, low ponytail. At Alice and Olivia, hairstylist Marshall Lin used Fekkai products to create a wavy version. At Public School, Aveda Global Artistic Director Allen Ruiz used Aveda Smooth Infusion to smooth the hair into a "faux mini bob."

The most basic hair accessory -- a casually cut piece of black ribbon -- is also the coolest for fall 2016. At Kate Spade, hairstylist Recine for Beauty.com created a simple low ponytail and secured it in place with a velvet ribbon. And hairstylist Jordi Martinez-Fenoll for Fekkai created an almost identical look at Angel Sanchez.

At Mansur Gavriel, Bumble and Bumble Global Artistic Director Laurent Philippon used Bumble and Bumble Surf Spray and Dryspun Finish to braid models' hair with lots of texture before securing the ends with a ribbon. And at Suno, hairstylist Odile Gilbert for Kerastase Paris wrapped ponytails with ribbon and locked it in place with Kerastase Laque Dentelle.

Intricately knotted ponytails are another huge hair trend for fall 2016. We're predicting it now: It's going to be a good season for wedding hair.

At Leanne Marshall, Aveda guest artist Jon Reyman designed a macram�é-inspired cobra knot around the base of the ponytails. Meanwhile, backstage at Jonathan Simkhai, hairstylist Thomas Osborn used Catwalk by Tigi products to create a double "Nordic" knot.

These intricate knots may not be easy to recreate at home, but pin them for next time a pro styles your hair.

Glitter is always a good idea -- especially this fall where the trend will be to use glitter in unexpected ways.

At Opening Ceremony, makeup artist Yadim for Maybelline New York created a futuristic effect with pretty slashes of glitter across an otherwise bare face.

At Jenny Packham, Bobbi Brown dusted Sequin Eye Shadow (which won't be available until holiday 2016 -- put a reminder on your calendar now) across matte cheeks and eyes.

And at Brother Vellies, Sephora Pro Lead Artist Helen Phillips gave the trend a metallic slant with Kat Von D Metal Crush Eyeshadow in Static Age and Make Up For Ever Metal Powder in Sunflower Gold 1.

Season after season, makeup artists reinvent the classic cat eye, and the fall 2016 shows were no different. At Marc Jacobs, Francois Nars used practically every black eyeliner in his kit to create elaborate eye makeup looks, the most wearable of which was this open, almond-shaped outline. At Oscar de la Renta, Diane Kendal used M.A.C. Creme Liner in Black to create a similar yet subtler version of an open, squared off oval. And Val Garland used the same black liner at Monique Lhuillier to create a thick, blunt edge above the upper lashes.