Sizing sleepwear is not the same as sizing daywear. A pajama set has to work while you move and change position for hours, so the fit that flatters you in front of a mirror is not automatically the fit that lets you sleep. Here is how to choose, what the cut changes, and what "true to size" means in practice.
How do you choose the right pajama size?
Start from your usual size in shirts, then adjust for the cut rather than the number. On a relaxed, shirt-style set, your everyday size is normally correct; the ease is already built into the pattern.
The reflex to size up "for comfort" is where most people go wrong. A set already cut with a flowing fit becomes shapeless one size up: the shoulder seam falls down the arm and the extra fabric bunches under you when you turn over. Comfort comes from the cut and the fiber, not from excess fabric.
- Measure your bust and hips and compare them to the size chart on the product page rather than guessing from a label.
- If you fall between two sizes, let your shoulders and bust decide the shirt, since the pants usually have an elastic waistband with more tolerance.
- Prioritize the top. Buttons and collars are unforgiving; an elastic waist forgives a lot.
What should you look at in a shirt-style pajama set?
The shoulder seam, the button placket and the sleeve length. Those three points determine whether a set looks intentional or borrowed.
Where should the shoulder seam sit?
On a classic shirt-style pajama, the seam should sit close to the edge of your shoulder or very slightly beyond it. Well past the shoulder means the whole garment is hanging off you, and the collar will not sit properly no matter how relaxed the cut is.
How should the button placket behave?
It should lie flat with no horizontal pulling across the bust when the shirt is fully buttoned. Gaping between buttons is the clearest single sign that a top is a size too small, and it is the one thing a relaxed cut cannot disguise.
What about the pants?
Most pajama pants are made with an elastic waistband, sometimes with an adjustable drawstring, so the waist adapts across a range. What to check instead is the hip and the rise: the fabric should skim rather than pull across the seat, and there should be room to bring your knees to your chest without the waistband dragging down. Length should reach the top of the foot on straight-leg pants; a set with shorts is naturally more forgiving.
What is the difference between a relaxed cut and a fitted cut?
A relaxed cut adds ease through the chest, waist and hip so the fabric moves independently of the body. A fitted cut follows the silhouette with much less ease. Both are valid, they simply solve different problems.
- Relaxed or flowing: nothing presses against the body, air circulates between fabric and skin, and it does not restrict movement when you change position. It reads less defined standing up.
- Fitted: visually neater and less fabric to twist around you in bed, but any tightness will make itself felt over eight hours, particularly at the waist and under the arms.
Our sets are cut with a relaxed, flowing fit and an elastic waistband, so the comfort is designed into the pattern. That is the reason we do not recommend sizing up as a default.
Should you size differently depending on how you sleep?
Yes, and this is the adjustment most people never make. How warm you sleep should influence how much ease you want against the skin.
- If you sleep hot: stay with your true size in a relaxed cut and choose a lightweight, breathable fabric. Air moving between fabric and skin is what cools you. Short sets help.
- If you sleep cold: also stay true to size, but layer instead of sizing up. A robe over the set for the beginning and end of the night traps warmth far better than a larger pajama, which just admits cold air at the neck and wrists.
- If you move a lot in your sleep: avoid excess length in the sleeve and leg, which is what tangles.
- If you use your set for lounging as well as sleeping: lean toward your precise size, since it will be seen.
What does "true to size" actually mean?
It means the garment corresponds to the measurements published on its size chart, so the size you normally wear is the size you should order. It does not mean the piece is fitted.
This is a persistent source of confusion. A relaxed, oversized-looking pajama can still be perfectly true to size: the pattern includes intentional ease and the chart accounts for it. True to size means take your usual size and expect the fit the design intends. Sizing up beyond that is a stylistic choice, not a correction.
How should you check the fit once it arrives?
Try it on and then move the way you actually sleep. Standing still in front of a mirror tells you almost nothing about a garment designed for horizontal use.
- Raise both arms overhead. The shirt hem should not ride up to your ribs.
- Cross your arms. No pulling across the upper back.
- Sit down and bring your knees up. The waistband should stay put.
- Roll onto your side. Fabric should shift with you, not wrap.
- Check the buttons while seated, which is when gaping shows up.
To compare cuts, the latest collection shows the current silhouettes, and each product page lists its sizes and construction details.
Frequently asked questions
Should I size up in pajamas for comfort?
Not if the set is already cut with a relaxed fit. Sizing up moves the shoulder seam down the arm and adds fabric that bunches while you sleep. Order your usual size.
What if I am between two sizes?
Let the shirt decide. Choose the size that fits your shoulders and bust without pulling at the button placket, since pajama pants normally have an elastic waistband that adapts.
Do cotton pajamas shrink after washing?
Cotton can shrink slightly with heat. Washing cold and air drying rather than using a hot dryer keeps the fit consistent, so there is no need to buy larger in anticipation.
How should pajama pants fit at the waist?
The elastic should sit comfortably without pressing a mark into the skin, and the fabric should skim the hip rather than pull across it. If there is a drawstring, adjust it loosely.