There are a few ways to do this. It does depend on how many files you are dealing with.
One way is to place your flat pattern part onto a drawing sheet with all the details (as text somewhere on the sheet) coming from the parts custom properties.
Make sure the scale is 1:1 or you might have interesting results. The drawing can then be saves as a dxf.
If you have many parts, drop them into an assembly and put the assembly onto a drawing sheet. Add a bill of materials table so you have all the individual part info.
Send this as a PDF along with the individual dxf files and you will be away laughing.