Measure both your chest/bust and your waist/hips, then consult the brand's specific size chart. If your measurements fall into different size categories (e.g., medium top but large bottom), size based on the larger measurement and look for a suit with 4-way stretch that will accommodate the smaller area without excess fabric. Read reviews from other buyers with similar body types. When in doubt, contact the manufacturer's customer service—many can recommend sizing based on your specific measurements.
Ski Underwear · One-Piece Base Layer Suits
How do I know what size to order when I can't try it on?
Related gear types
If this answer nudged you toward a different style, these guides compare specs and trade-offs.
Midweight Base Layers
$35 – $130
Versatile, moderately insulated base layers that are the most popular choice for typical winter skiing conditions.
moderate insulationgood breathabilityeffective moisture wicking
Heavyweight Base Layers
$45 – $160
Maximum-insulation base layers designed for extreme cold, low-activity skiing, or cold-sensitive individuals.
thick fabric constructionhigh insulationbrushed or fleece interior
Merino Wool Base Layers
$50 – $200
Premium natural-fiber base layers prized for odor resistance, temperature regulation, and next-to-skin comfort.
natural odor resistanceexcellent thermoregulationsoft next-to-skin feel
More questions
- How do you go to the bathroom in a one-piece base layer suit?
- Are one-piece base layer suits too warm for spring skiing?
- What if the suit fits my torso but is too long in the legs (or vice versa)?
- Can I wear a one-piece base layer under a ski racing speed suit?