Scattered details can give a general picture of background. At 1500-500 BC some horse-tribes of Russian steppes were linked to Brahmins, who had Sanskrit "camara" meaning royal tassel, a yak-tail. This has the volume of 6 horse-tails and was used later by Genghiz Khan who hung 9 on a pole. The sporran's 3 is more manageable..The Brahmin king of Thailand uses 1 yak-tail as regalia today.
The ancient "good god" of Ireland was Eochaid "The Stallion", and Eochaid was father of Angus when the clans sailed to the Isles. Just a guess that they used tassels..