This drink was the first of it’s sub-era and this trend continues even today. There was a brief period in time where it was fashionable to name drinks and variate them slightly, by changing one or more original ingredients. Here is an early printing of this drink:
Food and drink in America: a history by Richard James Hooker in 1981
“Texas iced tea was a Long Island with tequila”
This is still believed to be the case, which is true, but not entirely. The original LIIT called for all 5 light spirits in the well, which would include tequila. However, as explained in the LIIT article, even in the start, many were confused over the composition of the drink. So, some might have substituted triple sec for tequila, or vodka for rum, there were a number of inaccurate publications of this drink.
The Texas Tea does infact call for tequila, but it is in addition to the tequila that should already be in the drink. The name “Texas” was just used to comform to this new era of naming LIIT variations after locations like we see with the “Tennessee Tea, Tokyo Tea, and Long Beach Iced Tea” . Given Texas has had the long standing perception of being associated with tequila, particularly Gold Tequila, it is likely it was originally made with the addition of Gold Tequila.
Here is another early printing of this drink:
Let’s party: parties with a theme by Kady Martin in 1986
“TEXAS TEA — 1 jigger of rum 1 jigger of tequila 1 jigger of vodka 1 jigger of gin, Pour mixture into pitcher with a 64 oz. Coca Cola. Serve in glasses over ice. Float a 1 jigger of Triple Sec on top.”
This drink dates between 1976 and 1980 and contained at least as of then:
Shake these ingredients:
Fresh Lemon Juice
Strain into a collins glass filled with fresh cubed ice.
Add charged Coca-Cola
Lemon Wedge Garnish