Shoe-Goo (comes in tubes) works well for attaching burlap (or netting) to base clothing (like a DCU or BDU uniform). It remains somewhat rubbery/flexible after drying.
Have used it often to construct Ghillies for military use.
If you intend to use a lot of low crawl stalking, leave the burlap or camo netting OFF of the lower front (belly/lower chest) of your jacket and upper front (knees/thighs) of pants legs.
Cut wide rectangular strips of extra uniform material (or even dark denim) and glue or sew them as double thickness patches to the knees, thighs, belly, and lower chest of your Ghillie top and bottom. They will serve as replaceable scuff pads, allowing the suit to survive longer after prolonged abrasive contact with the ground. This procedure will also provide a snag-free smooth surface for easing yourself along the ground.
Hit the sewn or glued patches with some spray paint to blend into base uniform or gear.
If you anticipate more upright crouched or standing stalking, go ahead decorate the front surfaces with your foilage (burlap).
As Adventurer 2 mentioned, you really don't have to go to any great lengths as far as fraying or feathering your burlap. It will fray by itself with minor use.
A mix of any color burlap will work (OD, grey, brown, tan etc.). Krylon flat paint can be used to dust equipment, hunting gear, and the suit itself. Burlap sandbags (buy a small bundle) make for great foilage strip material.
THE SINGLE BIGGEST MISTAKE YOU CAN MAKE IS TO MAKE THE GHILLIE SUIT TOO DARK IN TONE. You can always darken a suit (a little) to match conditions by adding a little dark foilage/burlap or dusting some darker spray paint onto the suit. It's much more difficult (if not impossible) to lighten something that is dark. That's why a desert pattern uniform (light) is often used as the suit base (instead of a darker BDU pattern or Olive Green uniform).