Added Jun 1, 2010
To complete the drafting of the pattern pieces, we add the seam allowances to the panel piece and introduce a rectangular piece of cloth for the battery holder. The size of this second piece is determined roughly by the size of the batteries we need to use. For the fiber optics cable I used, I needed two 9-volt batteries. Each 9-volt battery could be used to energize two fiber optics cables. So I used the small rectangular 9-volt batteries you can buy at the local grocery store (see step x below). These batteries are 1,6 cm x 2,6 cm x 4,7 cm (5/8" x 1" x 1-7/8"). Therefore I made the battery holders 7 cm x 6,5 cm (2-3/4" x 2-5/8"). The logic is that 7 cm is long enough to be able to close one end beyond the 4,7 cm length of the battery, while 6,5 cm is wide enough to wrap around the 2,6 cm width (i.e. folded down) and sewn into the seam allowance at the bottom of the vest.
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