According to the experts who have responded to this thread, the chigger-in-Spanish-moss is an old wives' tale.
If you need some, I can send a small box stuffed full lovely Spanish moss for postage. I gather it in a natural area where no chemicals are used. Just 'LMK'* in a Tree- mail.
*...by the way, I am old and had to look up your shorthand to understand that 'LMK' means' let me know'; wish people would spell out the words so all the readers can understand.