Welt

Definition and Overview

A welt is a tailoring finish in which a narrow strip of fabric is sewn to the edge of a body panel or pocket opening and folded over to cover the edge. It hides seam allowance and raw edges while adding durability and a clean appearance. The narrow strip of fabric used at the edge may also be called a welt.

In garment specifications, it is also common to use the term welt pocket for a pocket with a welt at the opening. In this case, welt refers to the strip of fabric that forms the pocket opening, and its scope differs from welt finishing, which covers the edge of the entire area.

Position in the Process

Welt finishing is done during the sewing process after cutting, as the individual parts are assembled. When applied to openings such as pockets, the process includes marking the opening position, sewing the welt fabric and reinforcing fabric, making the cut, turning, shaping the corners, and then finishing the pocket bag or reverse side.

Because some areas are difficult to finish after the parts have been sewn together, the sewing order is important. In mass production, the direction of the seam allowance turn, the grain direction of the welt fabric, and whether interfacing is used are confirmed at the sample-making stage and reflected in the specification sheet and process instructions.

• Clearly mark the opening position and welt width.
• Check the color, thickness, and grain direction of the welt fabric before stitching.
• After cutting, confirm that the corners have been fully turned.
• Use final pressing to adjust the edge shape and left-right symmetry.

Approach and Practical Points

The visible width of the welt can be specified not only in the design drawing but also in the approved sample and cross-sectional image to reduce misunderstandings. In addition to using the same fabric as the shell fabric, there are also designs that use contrasting fabric or another material to make the edge stand out.

With thick fabrics, pile fabrics, and highly stretchy fabrics, the stitching can become bulky or the shape can become unstable, so the thickness of the welt fabric and interfacing should be considered in advance. For patterned fabrics, the way the pattern appears on the welt also affects the finished look.

Ordering and Quality Notes

When placing an order with a sewing factory, specify the area where the welt is to be applied, whether it is a single welt or double welt, the finished visible width, the welt fabric specification, whether interfacing is used, and whether stitching is required. For pockets, also instruct the pocket bag specification and reinforcement positions such as bar tacks.

During quality inspection, check the left-right difference in welt width, distortion at the opening, bulk at the corners, exposed stitching, and puckering in the shell fabric. If the welt is designed too narrow, the edge may come loose during use or the seam allowance may show, so sample verification matched to the material is necessary.

Differences from Similar Terms

Piping often refers to an edge trim with a cord wrapped in fabric, or the finish itself, and it creates a raised effect. A welt does not necessarily include a cord and is finished as a relatively flat strip edge.

Bias tape finishing is a method of wrapping a curved fabric edge with tape cut on the bias. A welt also finishes an edge with fabric, but it may be used to describe a specification that includes forming an opening such as a pocket mouth, so it is important to confirm the application and shape with a drawing or sample.

Frequently Asked Questions