Oklahoma is having a sales tax holiday this weekend, August 7th -9th.
"Sales of any article of clothing or footwear designed to be worn on or about the human body and the sales price of the article is less than one hundred dollars ($100) are exempt." - Oklahoma Tax Commission Website
Also, for those mommies out there that are buying diapers, diapers are on the list!! Both disposable and cloth. Tulsa's Sales tax is 8.517% so on a $40 box of diapers that would normally be $43.41 with tax is now just $40. That is better than any diaper coupon I have ever come across. Here is a nonexclusive list of clothing that is exempt from sales tax.