Hell for leather is not and never was a thing. The idiom was hell bent for leather and it described being in a hurry not in a bar.
I like the song “Leather & Lace” by Don Henley and Stevie Nicks.
Well now hang on just a second there. It seems “hell for leather” may have been a British idiom that was modified into “hell-bent for leather” later in the US.
https://www.dictionary.com/browse/hell-bent—for—leather