Set-in
The classic. The armhole is a curve on the body panel, the sleeve has a matching curved head, and the seam sits on the shoulder point where a shoulder actually is.
What it gives you: the cleanest shoulder line and the closest fit. The seam sits where the eye expects it, so the garment reads as tailored even in a knit.
What it costs: the most precise sewing of the three. A sleeve head has more length than the armhole it goes into and that extra has to be eased in evenly; done badly you get puckers along the top of the sleeve. It's also the fussiest to grade, because the armhole and the sleeve head have to keep matching across every size.
Print area: the largest uninterrupted front panel of the three, since no seam crosses the chest.
Raglan
A raglan sleeve runs diagonally from the underarm to the neckline, so the sleeve includes the shoulder. Baseball tees, most sweatshirts built for movement.
What it gives you: range of motion. There's no seam sitting on the shoulder joint to restrict it, which is why it's the athletic default. It's also forgiving of shoulder width differences between wearers, so it grades over a wider range before the fit degrades.
What it costs: two long diagonal seams instead of two short curved ones, and they're visible from the front. The shoulder line is soft rather than defined, which suits some garments and undermines others. Colour-blocking is easy and often the point.
Print area: reduced. The raglan seams cut into the upper chest, so a large front print either sits lower or crosses a seam — and most printers charge extra for crossing a seam, or refuse.
Drop shoulder
The shoulder seam is deliberately moved down the arm, so the body panel extends past the shoulder point and the sleeve is shorter and straighter.
What it gives you: the boxy, relaxed silhouette that's been the streetwear default for years. It's also the cheapest of the three to sew: the armhole is a shallow curve or nearly straight, the sleeve head needs no easing, and the whole join is a fast overlock pass.
What it costs: fit precision. The shoulder point is nominal — where the seam lands depends on the wearer's frame as much as the pattern — and the garment gathers fabric under the arm. That's the look, but it means the armhole depth has to be generous or the garment binds when the arms lift.
Print area: the largest of all three, because the body panel is wider and the seam is further out.
Side by side
| Set-in | Raglan | Drop shoulder | |
|---|---|---|---|
| Shoulder definition | Sharp | Soft | None — nominal |
| Range of motion | Moderate | Best | Good, if armhole is deep |
| Sewing difficulty | Highest — easing required | Moderate | Lowest |
| Grading tolerance | Narrow | Wide | Wide |
| Front print area | Large | Reduced by seams | Largest |
| Fabric consumption | Efficient | Efficient | Higher — wider body panel |
| Reads as | Classic, tailored | Athletic, retro | Relaxed, contemporary |
Choosing
Set-in for a garment that should look considered: a heavyweight tee with a clean shoulder, a polo, anything where the shoulder line is part of the design.
Raglan for movement, for colour-blocking, and when your size range is wide and you want one pattern to fit more bodies acceptably.
Drop shoulder for a boxy silhouette, for the biggest possible print, and when unit cost matters — it's genuinely cheaper to make.
Our view: a first style in a drop shoulder is the lowest-risk choice available. The pattern is more forgiving, the sewing is simpler so fewer things come back wrong, and the silhouette is currently in demand. The condition that changes it: if the shoulder line is the design, a drop shoulder erases the thing you were making.
What to write on the tech pack
Name the sleeve type explicitly, then give the measurement that pins it down. For a set-in, that's shoulder-to-shoulder plus armhole depth. For a raglan, it's sleeve length from centre back neck, because there's no shoulder point to measure from. For a drop shoulder, it's both shoulder-to-shoulder and where the seam is intended to land relative to the shoulder point — otherwise the factory decides how dropped "dropped" is.
And grade the shoulder at roughly a quarter of the chest rate, whichever type you choose. Over-grading the shoulder is how a set-in accidentally becomes a drop shoulder in the largest sizes.
Boxy, drop shoulder and oversized as pattern decisions · how to measure each type · crewneck construction · all guides