What yang tai chi style is oldest?
The Yang Style dramatically changed in the 1900s with its emphasis shifting from life or death combat to health approaches and less hardcore martial art applications. One of the greatest shifts was the increased emphasis on using push hands as a fundamental foundation of the martial components (something not existing as much within the old yang style).
Teachers of the Old Yang style are much rarer and hard to come by than those familiar with the New Yang Style, and the subject is extremely misunderstood in most circles.
Tai Chi Master Bruce Frantzis has a very good appendix on the subject on pages 337 and 338 of his book "Power Of The Internal Martial Arts" (he was fortunate enough to learn and inherit the lineage of the Old Yang Style from Lin Du Ying).
How do you find a sewing pattern for an authentic tai chi uniform?
You can try Folkwear.com and look at their Asian collection. The Chinese pajamas are just like the tai chi uniform. Just make sure the fit is very loose.
How many times do you have to practice taichi forms in a day?
This depends on you. Some people do it first thing in the morning only, others only later in the day, others 5 times a day. It depends when you have time and the extent to which you want to do it.
In jiu-jitzu how many red belts are there in the world?
There are 3 red belts in the whole wide world and i know one of the as a friend.