Generally, you will only have one pattern for both sides of the garment. You then double your fabric when cutting or flip the pattern. Patterns are symmetric.
There are times when you want to create an asymmetric design. You'll need a pattern for the right and left sides so they can be combined and modified.
This tool makes a mirror of an existing pattern (all layers) or a single layer. If the layer you select has children and it isn't the pattern top layer, those children will not be mirrored.
This tool will not mirror reference geometry without start and end points. It will also ignore shapes.
Select a Layer to Mirror
If you want to mirror the entire pattern, select the topmost layer. Otherwise, select a child layer.
If you are unsure of what you want to mirror, use the Layer Visibility tool. Hide and show layers until you find the one you want to mirror.
If you mirror over the X axis, the copy will be as though the layer were folded up or down.
If you mirror over the Y axis, the copy will be as though the layer were folded right or left.
The mirrored pattern will be placed on an imaginary line drawn horizontally (X axis) or vertically (Y axis) through the axis point.
You may choose for the mirrored copy to be placed a distance from the original. Enter the distance in the Offset box.
The imaginary line mentioned above originates from an axis point. Select the axis point.
The pattern / layer will be mirrored. You'll see in the image below that the copy is 20mm away from the original as specified in the Offset value.
This entire pattern was mirrored over the X axis with no offset. See how the two copies share the side neck point? That point was designated as the axis point.