you will need
1 back patch
1 elmers glue or a mid grade house hold glue
tap measure or ruler
2 pieces of card board the size or larger than the patch
and sewing needle / thread or dental floss-works great and stays long time!
Step 1: So You Have the Vest
lay it down flat
take a measure ment to a center area
then tape it on top and bottom
try it on look in a mirror , make sure the distances are at least similar and even is a must ...
Step 2: Glue Ing
and remove on side of the tap fold over so that the other is keeping it on and even
put glue in a zig zag and spread it across
make sure it is enough to keep it on but not clumpy
then put vest down ...
even out and make flush
then put the other piece of card board on it
place heavy item on top, boxes work or even a guitar care anything with weight
Step 3: Now Almost Done
take the vest and sew the edges how ever you like ...
as long as it is gonan stay on
thats it you have a properly alligned vest that looks good and wont come off!