How to layer under a one-piece

The most common mistake with a one-piece is dressing for it like a jacket and salopettes. You do not need three layers. The suit is double lined with a back-brushed thermal core, so the job of anything you wear underneath is to move moisture, not to add warmth.
And here is the part that surprises almost everyone: from the waist down, you need nothing at all.
NOTHING UNDER THE LEGS. REALLY.
No thermal leggings. No base-layer bottoms. No bunching at the knee, no ridges at the boot cuff and no second pair of anything to pack.
The legs of every Paparazski suit are fully lined with the same back-brushed thermal core as the body, so they are warm straight off the hanger. Add the four-way stretch and the fabric moves with you rather than against you, which is exactly why anything worn underneath only gets in the way.
It is one of the things we are proudest of. Step in, zip up, boots on. Your legs are done.
ON TOP: ONE FINE LAYER
Start with a fine merino or technical base — long sleeve, close to the skin, seamless where possible. Anything thick will fight the four-way stretch and spoil the sculpted line.
Merino is our first choice. It regulates temperature brilliantly, keeps you comfortable from the first lift to the last run and, importantly for a long weekend, does not hold on to smells. A roll neck looks particularly good when the zip comes down at lunch.
Look for flat seams and a close fit through the arms. The suit is cut to follow the body, so a baggy top will show.
GENUINELY COLD DAYS
On properly cold days — early season, high altitude or a biting wind on the top lifts — add a thin mid layer over the base rather than swapping to a heavier base. A featherweight grid fleece adds warmth without volume and can come off at lunch.
Keep it to your top half. Even at minus fifteen, the legs look after themselves.
If you tend to feel the cold, a slim down gilet worn on top of the suit for chairlifts and terraces is a far better idea than piling layers underneath. It comes off in seconds and never spoils the silhouette.
SOCKS, NECK AND HANDS
Finish with good socks — one pair, ski-specific, worn straight against the skin. Two pairs, or socks pulled over leggings, are the fastest route to cold feet: they restrict circulation and create pressure points in the boot.
Add a neck warmer you can push down when the sun arrives, and proper ski gloves. Warm hands make the whole day better.
WHAT TO LEAVE AT HOME
Thermal leggings. Chunky jumpers. A second pair of socks. A bulky ski jacket "just in case".
The suit has already done the thinking for you.
THE WHOLE SYSTEM
One fine base layer on top. A featherweight fleece if it is really cold. One pair of good socks. A neck warmer. Gloves.
And nothing under the legs.
That is the whole system. Lighter to pack, quicker to dress and far better looking on the mountain.