Unisex ski base layers can work fine in certain situations, but they come with real trade-offs. Since unisex cuts are typically based on men's proportions, they tend to have broader shoulders, longer torsos, and narrower hips. For guys, the fit is usually decent. For women, that often means excess fabric at the shoulders and a loose, baggy fit around the hips and waist—exactly where you don't want cold gaps or sagging fabric under your snow pants.
Where unisex makes the most sense is for budget-conscious buyers, rental programs, or casual days where performance fit isn't a priority. They're also a practical choice for kids who are between youth and adult sizes. If you do go unisex as a woman, plan to size down and check the brand's size chart carefully.
For regular riding, though, gender-specific base layers are worth it. They're cut to match your actual proportions, which means better moisture management, no bunching under your layers, and fewer cold spots during long lift rides.