Longline T-Shirt Manufacturer: Lengths, Hems and Fit Specs

Longline t-shirt manufacturer programs extend a tee's body roughly 8–15 cm below a standard length, often with curved, dipped or split hems, in 180–260 GSM cotton jersey. Control side-seam twist, plan 3–6% shrinkage and allow 10–15 days for a sample and 25–40 days for bulk, with MOQ depending on style and fabric.

Longline tees come back every few seasons, usually tied to layering trends in streetwear. The idea is simple: make the tee longer. In production, though, extra length raises questions about hem shape, fabric weight, side-seam twist and grading that a standard tee never faces. This guide explains how a longline t-shirt manufacturer handles those questions and how to brief a factory so your sample and bulk match.

What is a longline t-shirt manufacturer?

A longline t-shirt manufacturer is a factory that patterns and sews tees with an extended body length, typically 8–15 cm longer than a standard fit, often finished with curved, dipped or split hems. Most programs use 180–260 GSM cotton jersey and control side-seam twist, which shows more on a long body. A typical sample takes 10–15 days and bulk 25–40 days after approval.

How long should a longline tee be?

There is no single standard, so define length clearly in your size chart. Measure from the high point of the shoulder to the hem at centre back, and state the length for every size. As a guide, a longline tee usually adds 8–15 cm compared with the same size in a regular fit. Longer than that and the tee starts to read as a tunic or a dress, which changes how retailers merchandise it.

Grade the length by size. If you add the same fixed length to every size, small sizes look much longer in proportion than large ones. Most factories grade length in small steps, often 1.5–2.5 cm between sizes. Our guide on how to create a size chart for a clothing brand explains how to set measurement points and tolerances.

Which hem shapes suit longline tees?

The hem is where a longline tee shows its character. Common options are:

• Straight hem. Clean and simple; works with boxy streetwear fits.
• Curved hem. A gentle curve at the sides, slightly longer at front and back. The most common longline look.
• Dipped or drop-tail hem. The back is noticeably longer than the front.
• Split side hem. Short vents at each side, often combined with a longer back. See our note on how to RFQ a split side hem on heavyweight tees.
• Raw or cut edge. Unhemmed for a deliberately undone look; needs a fabric that does not curl.

Curved and dipped hems are harder to sew neatly than straight hems, especially in heavy jersey. Ask for a hem stitch test and check that the hem lies flat after a wash.

Developing longline or extended-length tees? Weavnora patterns and sews relaxed and oversized cotton tees with custom hems and lengths. See our oversized t-shirts page, then request a quote with your length targets and fabric.

Which fabric weight works best?

Longline tees use more fabric per garment, so weight affects both feel and cost:

• 180–200 GSM. Drapes easily, comfortable for layering, but can cling and show twist.
• 200–240 GSM. A balanced choice; enough body to hang cleanly without feeling heavy.
• 240–260 GSM. Premium and structured; keeps the long body away from the hips but adds weight at the hem.

Use compacted or pre-shrunk cotton to reduce length loss after washing. Length shrinks more than width in most jersey, often 3–6%, and on a long garment that can mean several centimetres.

How do you control side-seam twist?

Twist, also called spirality, is the tendency of single jersey to rotate after washing, so the side seam moves towards the front or back. On a standard tee a little twist is barely noticeable; on a longline tee it becomes obvious because the seam travels further. Control it by:

1. Choosing jersey with low spirality from the mill, often compacted or set during finishing.
2. Cutting with the grain line aligned to the fabric wales.
3. Running a wash test on the sample and measuring twist, with a target such as 3–5% maximum.
4. Using tubular, side-seamless bodies for some fits, which removes the side seam altogether.

How do washes and prints change a longline tee?

Garment dye and vintage washes suit longline tees, but they add shrinkage and can exaggerate twist, so test the washed sample on a full size set before approving bulk. If you plan a split or dipped hem, check that the vents and hem curve still sit correctly after washing, because uneven shrinkage between front and back panels can pull the hem out of shape.

For decoration, remember that the extra length moves the visual centre of the tee lower. A chest print placed at a standard height can look too high on a long body, while a large back print often needs to sit a little lower than usual. Agree placement from the high point of the shoulder for each size, and photograph the approved positions for the bulk line. Long bodies also show cracks and stretch in large prints more easily, so test the print stretch on the actual fabric.

Longline vs oversized t-shirt: which option fits?

Buyers often mix up longline and oversized tees. They solve different style goals, so compare them on clear selection criteria.

The trade-offs are silhouette versus fabric use and fit risk. A longline tee keeps a closer body and focuses attention on the hem, while an oversized tee gives a boxier, more relaxed look and uses more fabric. If you want the oversized route, read our oversized heavyweight t-shirt sourcing brief or our guide to a drop-shoulder heavyweight tee factory.

What should a longline tee brief include?

Give the factory a tech pack that covers the full length by size, hem shape with front and back length difference, vent length if split, fabric weight and composition, twist and shrinkage targets, collar rib, seam types, decoration placement and labels. State whether the tee is garment-dyed or washed, because that changes shrinkage. Request a size set, not just one sample size, because length proportions change across sizes. For more tee styles and guides, start from the custom t-shirt manufacturing hub.

Longline t-shirt manufacturer: typical specs and key numbers

These are typical industry estimate ranges, not quotes; confirm actual figures with your supplier for your fabric, quantity and destination.

Key takeaways

• Longline tees are typically 8–15 cm longer than a regular fit in the same size.
• Grade length by size so proportions stay balanced.
• Curved, dipped and split hems need hem stitch and flatness checks.
• Twist is more visible on long bodies, so set a twist target and test after washing.
• Longline and oversized are different patterns; specify which you want.

Request a longline t-shirt quote

Ready to develop a longline tee? Send your size chart, hem shape, fabric weight, colours and quantities through our quote request form. MOQ depends on style and fabric, so we confirm it in your quote along with sampling time and an itemised price.