These three get used interchangeably, and they shouldn't be. They came from the same place and share a fair amount of rooted history, but they split off, and the differences are easy to spot once you know what you're looking at. Here's the field guide.
The shared roots
All three trace back to 1950's rock and roll and the clothes that came with it. The swing skirt, pinup cut, pompadour, leopard print, and cherries. Every one of these styles keeps some part of that originality. What separates them is what got added on top, and how much of the original idea survived.
Rockabilly: the original, kept bright
Sound: 1950's rock and roll music and its revival - upright bass, clean twang, songs about cars and girls, and Saturday night.
Look: A faithful 1950's throwback. Swing and pencil skirts, halter dresses, high-waisted everything, victory rolls, and headscarves. Polka dots, cherries, anchors, and gingham patterns.
Palette: Bright and confident. Red, turquoise, candy pink, black, and white used as color, not as a mood.
Tell: If it looks like a diner in 1957 and nothing in the outfit is dead, it's rockabilly.
Gothabilly (Hellbilly): the same clothes, in mourning
Sound: Where goth and rockabilly overlap - darker, slower, more reverb, and more blues.
Look: Black silks, satins, lace and velvet, corsets, top hats, antique jewelry, PVC and leather.
Palette: Black does most of it, with deep red, purple, or bone as the accent.
Tell: Vintage shape plus graveyard prints, but still neat and elegant. Someone dressed for a funeral they intend to enjoy. That's gothabilly.
Psychobilly: the same clothes, gone wild
Sound: Rockabilly crashed into punk in the late 1970's and early '80's - faster, louder, upright bass played like a weapon, and lyrics full of B-movie monsters.
Look: The vintage base is still there, but it's been roughed up. Leopard print, horror movie graphics, zombies and creatures, wrecked hair, and the quiff worn tall and aggressive.
Palette: Louder than gothabilly and dirtier than rockabilly - leopard, acid green, blood red, and black.
Tell: If the outfit looks like it's been in a fight and won, it's psychobilly.
The quick version
- Rockabilly - vintage shape, bright palette, no horror.
- Gothabilly - vintage shape, dark palette, elegant horror.
- Psychobilly - vintage shape, loud palette, unhinged horror.
Same skeleton, three different creatures hanging off it.
Does any of this matter?
Only as much as you want it to. Nobody at a show is checking credentials, and most people who've been in these scenes a while wear pieces from all three depending on the night. The labels are useful for finding things - knowing that you want a gothabilly dress rather than a rockabilly one saves you a lot of scrolling - and not much use beyond that.
If you're working out which direction you lean, the fastest test is the palette. Reach for the bright version and you're rockabilly. Reach for black and elegant, gothabilly. Reach for whatever has a monster on it, psychobilly. Everything else is negotiable.