There are various types of Japanese tea and tea sets and I can imagine how it is confusing. If it is possible, please ask your loved one what does exactly "traditional Japanese tea set." mean. If he's talking about tea set for "Maccha (Matcha)" or something (Maccha is "powdered tea"), you need to purchase the set contains "Maccha cup", "bamboo whisk" and "bamboo spoon". Although powdered tea is not served for daily drinking use, there is a possibility that he's taliking about Maccha because he mentioned "traditional ".
These sets are for powdered tea.
http://www.maiko.ne.jp/english/shopping/tea_ware201.htm
http://www.maiko.ne.jp/english/shopping/tea_ware202.htm
If he's talking about common "leave tea" (not powdered), these are also "traditional " tea sets.
http://asianideas.com/chbltease.html
http://asianideas.com/sqsiteaset.html
Anyway, since my English skill is poor and I can barely explain about Japanese tea, if you want further information, please check this site. I hope this website will help you.
http://www.maiko.ne.jp/english/chako.htm
Good luck!