Left, Twenty8Twelve on the runway; available at nordstrom. Right, the "Twiggy" from James Jeans. Photos courtesy of Twenty8Twelve | James Jeans.

"Jeggings." Add it to your vocabulary and keep doing those lunges because the jean of the season isn't getting any looser, hence the new leggings-influenced term for ultra-fitted jeans.

I recently scored the "Twiggy" by James Jeans; available at shopbop, and while I'm as modest as the next girl (well, almost), I waited until a skinny day to even try them on.

Surprise! Not only do they not make you look fat, but they possess a mystical slimming, butt-lifting and thigh-shaping effect. I swear!

I was advised to go up one size from normal and I can breathe, eat a few bites of salad and everything.

Hussein Chalayan also created an extremely body skimming style, aptly called the "Legging" (you might need a shoe horn to get them on) for his collaboration with J Brand, The designer's capsule collection is currently on display in the window of Barneys New York on Madison Avenue in New York City.

How to wear the trend? Treat the tight jeans like leggings: Avoid tucking anything into them or wearing cropped tops -- despite the runway model's leggy look (above left) -- it's not flattering on the rest of us.

A longer, belted shirt or cardigan paired with killer ankle boots or demure flats is the chic and current way to go.