Jerseys come in a large variety of shapes and sizes, and depending upon how they're folded, the jersey design can become even more varied. You can easily create a custom opening for a jersey with the minimum amount of effort.

Start by laying out the openings. We want them to overlap a little so that we can merge them. We're going to design half of the jersey then mirror it in Trace to create the other half of the jersey. By going through these steps, you can customize the design for the particular jersey you are working on. These steps can be used to make other shapes as well, so it is not limited to just making jerseys.

Place a one layer #402: Classic on the mat and make it 17x17. 

Click on the Parameters tab and change the Radius to 6. This controls the arc of the neckline.

Enter 45 in the Rotation field. We now have the neckline. 

Move it to the top of the mat.

Bring over a #101: Rectangle and make it 5x11. 

In the Rotation field, enter 28 degrees.

Move it to align with the left corner of the shoulder point.

Bring over another one layer #101: Rectangle and make it 5x8. 

In the Rotation field, enter -42 degrees.

Move the opening to align it with the lower corner of the left upper arm.

Bring over another one layer #101: Rectangle and make it 16x14. 

Align it so that it makes the body portion of the jersey. 

Holding the CTRL key, select all of the openings and click the Group Selection button. 

The openings will merge together.  

If any of the corners where the openings meet up cause unexpected bumps when merged, click the Group Selection button again to ungroup them, then click on the background to unselect all of the openings. Click and move the opening to the desired position, then try remerging the openings again.

Save the design in case you need to go back and alter it. You can always use this as a boiler plate for future jersey designs. You can make the arms bigger, or change the rotation. You can merge other template shape as well. There is a wide variety of possibilities.

Bring the design into Trace via the Right-Click Menu or from the Cut Preview Screen.

Double the current Design Bounds width by entering the new number in the Width field.

The design bounds widen so we have room to mirror our jersey half.

Click on the Draw radio button.

Click on the Line button.

Right-click on the center point of the bottom of the jersey.

Hold the CTRL key down to put the drawing tool into Ortho mode. 

Click somewhere past the top of the jersey.

Hit ESC to stop drawing.

We now have drawn our axis line that we are going to mirror the design with.

Click Edit > Break All Intersections.

All of the objects intersecting with the center line we drew are now broken where they intersect.

Click on the right side of the jersey. 

Click the Delete button.

The right side of the jersey has been deleted.

Click on the left side of the Jersey.

Click the Mirror button.

Right-click on the top of the center line.

Right-click on the bottom of the center line.

The left side of the jersey is now mirrored over to the right side.