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Two common sportswear seam types are overlock, which joins or finishes edges on many knit garments, and flatlock (or flatseam), a low-profile panel join often visible on activewear. Coverstitch, binding, bonding and bartack reinforcement are other common options, and a garment construction specification should record the chosen seams, finishes and important dimensions. Voyager Sportswear can review a reference garment and propose the construction, so you can start from the result you want rather than from stitch names.
Once the construction is agreed, the seam groups, finishes and important dimensions go into the tech pack, which gives the sample review and bulk checks one shared reference.
Distinguish a seam from a stitch
A seam describes how materials are arranged and joined, a stitch the thread formation used to join them. Similar-looking seams can use different stitches, and one stitch can serve several operations. A close photograph of both sides of a reference is often more useful than an uncertain label. Coats explains the difference in its guides to seam types and stitch types.
| Common term | Typical use | What to check |
|---|---|---|
| Overlock / overedge | Joining or finishing edges on many knit garments | Seam allowance, stretch, security and feel against skin |
| Flatseam / flatlock | Low-profile panel joining, often visible on activewear | Exact construction, thread coverage, bulk and movement |
| Coverstitch | Knit hems, trim attachment and other operations depending on stitch type | Hem width, extension, skipped stitches and edge coverage |
| Binding | A strip enclosing an edge, such as a neckline | Finished width, colour, tension and comfort |
| Bonding | Joining or finishing with compatible adhesive materials | Material suitability, durability, appearance and availability |
| Bartack or other reinforcement | Local support at selected stress points | Position and suitability for the fabric and expected load |
A seam called flatlock is not automatically chafe-free, and not every pocket needs a particular reinforcement. Confirm the construction and performance you need.
Place seams around use and fit
Think about where equipment or movement puts pressure: a shoulder strap, saddle contact, the inner thigh or the waistband. Seam position, allowance, thread and fit all affect comfort. Reducing seam bulk can help, but removing a panel can also change the shaping and fabric consumption.
For a match jersey, review shoulder movement, underarm comfort, neckline and hem. For leggings, review the inseam, gusset and waistband in the intended movement. For shorts or jackets, include pockets, closures, cuffs and any lining. A wear sample shows what a flat inspection cannot.
Connect panel changes with artwork
On Voyager Sportswear's custom sublimated garments, the fabric is cut into panels, the design is printed onto transfer paper and transferred to the panels by heat, and the panels are then sewn. The artwork has to allow for panel shapes and seam allowances. A repeating roll pattern can be printed before cutting, and either route still needs care at the seams.
Moving a seam, changing a sleeve shape or adding a panel may mean revising both the pattern and the artwork. Check stripes or graphics that cross seams on a sewn sample and agree the acceptable alignment. Binding and visible thread colours are separate design details and should be specified alongside the printed colours.
Record the details that distinguish the garment
| Construction area | Useful specification |
|---|---|
| Main joins | Seam arrangement, intended stitch or reference, allowance where relevant |
| Hems and openings | Finished width, edge treatment and movement required |
| Neckline | Shape, collar or binding, tape and visible stitching |
| Waistband | Finished height, elastic arrangement, drawcord and recovery requirement |
| Pockets and closures | Opening dimensions, zip or fastening, lining and reinforcement |
| Visible stitching | Thread colour and appearance; technical settings where agreed |
If you have no established construction, mark these as development questions. There is no need to invent stitch density or thread specifications just to fill in a form. Ask for the confirmed sample and production specification to state what was selected.
Approve appearance and function together
Inspect seams inside and out for consistency, puckering, skipped stitches, exposed edges and unintended bulk. Check movement without forcing the garment beyond its intended use. Where laundering may change seam appearance, elasticity or bonding, assess it, and agree specific tests where they are required.
Send one consolidated set of comments with marked photographs, showing which details need correcting. Confirm the approved revision and how substitutions will be handled. The sampling guide explains how to record approval so that no construction detail is left open to interpretation.
Questions and answers
What is the difference between flatlock and overlock seams in sportswear?
Overlock, or overedge, joins or finishes edges on many knit garments, while flatlock, or flatseam, gives a low-profile panel join that is often visible on activewear. For overlock, check seam allowance, stretch, security and feel against the skin. For flatlock, confirm the exact construction, thread coverage, bulk and movement. A seam called flatlock is not automatically chafe-free, so check comfort on a worn sample.
What should a garment construction specification for sportswear include?
A sportswear construction specification should record the main joins with seam arrangement, intended stitch or reference and allowance, hem and opening widths with edge treatment, neckline shape and binding, waistband height, elastic and drawcord, pocket and closure details, and visible thread colour. Where no construction is established, mark these points as development questions instead of inventing stitch density or thread specifications, and ask that the approved sample and production specification record what was selected.
Can seam placement affect sublimated artwork on a sportswear garment?
Seam placement does affect sublimated artwork, because the artwork has to account for panel shapes and seam allowances. Moving a seam, changing a sleeve shape or adding a panel may require both pattern and artwork revisions. Assess stripes or graphics that cross joins on a sewn sample and agree the acceptable alignment. Specify binding and visible thread colours as separate design details alongside the printed colours.
