A short article by Ralph Griswold on how to tell whether a fabric produced from a drawdown pattern will hang together, or fall apart into separate pieces. It describes Clapham's mathematical method (ranking and rearranging rows and columns) and the Grünbaum and Shephard method of lifting off threads step by step, each worked on an 8x8 example. It also gives Clapham's theorem with a table of over/under thread counts, a note on constructing unsound interlacements, and a reference list.