Some PDF patterns now offer the option to use layers.
The main reason people like to use layers is because you are able to print only the sizes that you are interested in which can make cutting out and blending sizes easier.
If you haven't used layers before, here is a quick run down of how it works.
2. Save your PDF file to your computer (currently it is not possible to print with layers from mobile devices).
3. Right click to open file with Adobe Reader.
4. Click on the layers icon
If your layers icon is not appearing, go to View > Show/Hide > Navigation Panes > Layers
5. Select the sizes you wish to print by deselecting unwanted sizes.
5. Ensure actual size is selected when printing.
At this stage the only BOO! pattern offering layers is the SQUAD TOGS. As time permits the most popular older patterns will be updated to include layers.