Bag with darts and a tab — test leather patterns

Bag with darts and a tab: size adjustment, PDF, SVG, DXF patterns and A4 printing. Test design based on open references; check the dimensions and assembly on a mock-up.

Bag with darts and a tab: design example

Historical drawing without scale: dimensions are estimated. Two lower darts on each wall, back with an integral shaped flap and tab, fastening loop, strap with two attachments. 3D volume is indicative; check dart joins and lacing on a mock-up.

Open this example in the designer

The example opens with the dimensions specified below. Its changes are saved separately from your regular work. You can return to it using the link in the editor.

Example source parameters

Linear dimensions are given in millimeters. Parameter names match the designer fields; these are the initial settings and can be changed.

Parameter	Value
Body width	240
Body height	220
Body depth	55
Flap drop	195
Dart depth	38
Dart intake	18
Strap blank	1100
Strap width	22
Leather thickness	1.5
Stitch offset from edge	4
Additional seam allowance	0

Parts in this example

The dimensions below are derived from the geometric model. The parts list changes with the parameters and enabled options.

Piece	Size, mm
Front with two darts	225.1 × 220.0
Back with darts, flap, and tab	225.1 × 496.2
Closure keeper	60.0 × 16.0
Strap attachment · left	22.0 × 70.0
Strap attachment · right	22.0 × 70.0
Shoulder strap	1100.0 × 22.0

How the size changes the pattern piece

Calculation example: the body width parameter was changed from 240 to 264 mm. The diagram shows the Front with two darts piece before and after recalculation at the same scale.

Bag with darts and a tab: Body width 240 and 264 mm — The dimensions below the drawing refer to the outer cut-edge contour. This is the result of a geometric calculation.

Open modified example

You can also download the modified JSON project. After modification, check the assembly on a mockup.

Download the pattern example

The files were generated using the standard VLOTHO CAD export from the parameters specified above. They show the model geometry and do not replace checking the product in the material.

PDF A4, 14 sheets PDF patterns, 1:1 SVG patterns, 1:1 DXF patterns, mm JSON project

PDF A4 automatically selects portrait or landscape pages and rotates the pieces to reduce the number of sheets. For assembly, a 10 mm overlap, numbers, and alignment marks are provided. The standard PDF contains one piece per page. Both variants include a 100 mm test segment. For your own dimensions, modify the project and export a new PDF. How to print patterns at 1:1 scale.

What to check before cutting

The patterns have not been verified by sewing. Dimensions are approximate and not to scale; assemble a mock-up first. The card contains a generated illustration of the proposed product.

VLOTHO CAD builds a geometric prototype. Allowances for bending, skiving, assembly thickness, and construction methods are determined by your material. Start with a paper mockup and a trial piece.

How to get a pattern for your dimensions

Open the model and set the dimensions in millimeters. To reproduce the tabular example, first load its JSON.
Check the parts list and enabled options. Adjust the seam and dimensions for your material.
Save the project and export a new pattern set. After changing the dimensions, the previous files no longer correspond to the project.

Dimension reference for this model: Stitching line. Dimensions in the parts table and the outer cut contour may differ due to the seam allowance. How to check seam allowances and stitching lines.

Materials and assembly

Select the leather thickness and flexibility during trial assembly.

File preparation

Printing patterns on A4 at 1:1 scale · DXF units and layers before cutting

Next step

Construction and export instructions · Manual contour editing · All models