I searched and was unable to find Patons Camelot Wool. The best I can figure out is that you might be referring to Patons Kroy Socks FX in Camelot color. So, going by that thought, it would be a sock-weight yarn; or category 1 fingering weight yarn. Therefore having a ply of 4.
If I've totally misunderstood what yarn you're asking about, I've attached some URLs which might help you to translate the information you have on the yarnband into ply.
Composition: 65% acrylic, 34% rayon, 1% lycraSize:50g ballLength: 90m / 98ydRecommended needle size:4.50mm / US7 / 7UKTension: 16st / 29rows over 10cmWashing instructions: Handwash, dry flat
It is a 10 ply .. basically it is bulky .. 4 to the inch gauge ..
Inca wool is a 12 ply wool knits up well and sometimes you need to go down a size.
Alternative yarn choices: Patons Symphony or Wool Tweed DK
Patons has many weights of Tweed wool, so look through the Paton link and see if you can find the specific wool you are looking for and have an answer that way.
any type wool or knitting yarn that measures the same tension as caressa
Kind of wool worn by nobility
Patons
butt
Generally wool and cotton.
Inca clothes were primarily made of materials such as cotton, wool, and llama or alpaca fibers. They used cotton for lighter garments, while wool and alpaca fibers were used for warmer garments. The Inca were skilled weavers and created intricate textiles using natural dyes and a variety of weaving techniques.
Patons Ritz yarn was a bulky yarn. It was about 12 ply.http://www.ravelry.com/yarns/library/patons-ritz
The Inca used alpacas, llamas, and vicuncunas for wool. However, cotton became popular as the empire grew.
Incas made clothes from wool or (in warmer areas) from cotton. Ordinary people wore coarse alpaca wool but nobles wore fine vicuna wool. Inca men wore loincloths and tunics. Inca nobles wore gold ear plugs. Inca women wore a long dress with a cloak on top fastened with a brooch
It appears by looking at the Patons link I attached, that this yarn is still available. If you don't know where to find it in your area, contact Patons and they would be able to direct you to an online or retail store in your area. (at the top of the page of the Patons link, is a Store Locator tab that you could also click on).