Ski base-layer sets

With a set, yes. The included items for each model show whether both pieces come together.

It should follow your body without digging in. Bend knees and hips and raise your arms. Large folds are uncomfortable beneath skiwear, but excessive tension is uncomfortable too. Choose size from your body measurements rather than automatically sizing down.

Yes, if its fabric and warmth feel suitable. A heavily insulating combination may be too warm indoors. Check the waistband and neck opening especially, and avoid excess growing room that creates folds beneath other clothes.

You may need more warmth at the torso than the legs or different sizes for each. Separate pieces allow those adjustments. A set is convenient when its existing combination already matches your fit and planned use.