Use internal measurements, not the size label
A 20-, 24- or 28-inch suitcase label is not enough to order a fitted liner. Measure the usable interior of the actual model. External dimensions can include parts that the liner never covers: for example, Samsonite explicitly includes wheels in the published height of its Interlace case.
Identify the model, shell version and size before measuring. For a clamshell case, record the two halves separately. Name them consistently, such as handle-side half and opposite half, and show those names on the photographs and drawings.
Record the shape as well as the maximum dimensions
Use one unit throughout the drawing, preferably millimetres. Mark exactly where each measurement begins and ends. Record interior length and width, then measure depth at the positions relevant to the liner. If the shell tapers, include measurements at the opening and nearer the base.
Photograph the empty shell from above and from the side. Show rounded corners, changes of level and any areas where a rectangular dimension does not describe the shape. A paper pattern, suitable digital pattern or physical sample can help communicate contours that are difficult to capture with a tape measure.
- Interior outline and corner shape for each half.
- Depth and any taper or step in the shell.
- Measurement units, reference points and drawing revision.
| Measurement item | Reference to provide |
|---|---|
| Each shell half | Internal outline, depth, taper and corner shape |
| Hardware | Positions relative to a named edge or centerline |
| Pockets and dividers | Finished position, opening direction and attachment detail |
| Pattern edges | Separate cutting edges, seam lines and allowances |
| Identification | Model, size, shell revision, units and drawing revision |
Mark hardware, openings and attachment points
Locate wheel housings, trolley-handle channels, fixing points and other intrusions into the packing space. Give their positions relative to a marked edge or centreline. Note which areas the liner covers and where it needs clearance or a service opening.
Show the divider, pockets, zippers, straps and attachment method. Include zipper direction and the intended opening position. If an existing liner provides the reference, photograph it installed before removal, then label its panels and hardware positions. This preserves assembly information that can be lost when the liner is laid flat.
Separate finished dimensions from cutting allowances
Tell the supplier whether each dimension refers to the shell, the finished liner or a cut panel. Do not add an assumed allowance to every edge. Agree seam allowances, hems, folds and any intended ease as part of the pattern and assembly specification.
Coats treats seam construction as a defined combination of material arrangement and stitching. Include a seam sketch or reference sample where the edge finish matters, especially at zippers, dividers and shell attachments.
Confirm the sample in the actual suitcase
Send the measurement sheet together with the fabric reference, model and size quantities, and the required component list. Ask for the sample revision to be identified clearly. Fit that sample into the intended shell and check corners, hardware clearance, attachments, zipper operation and divider position.
Record adjustments against the drawing rather than relying on an unlabelled photograph or an informal message. Approve the revised installed sample and pattern together before the production specification is fixed. Repeat the check for each materially different shell or size.