Originally Posted by Tartan
I would fold the dots over a selvage and staple through it. It won't damage the fabric and they are secured to avoid confusion and price changing. Of course all those nice old ladies wouldn't do it on purpose but if the tag falls off, it could happen.
If they are put in a consistent spot - maybe 1/4 inch from a corner - then the check-out people would be able to find/spot the dots easily.
Also use a marker that won't run or smear if it gets wet or damp.
Some weather conditions do make the dots, etc. fall off easily.