Do you have the same thing in another colour?
'Stessa' — STES-sa. Double 's'.
Use when the style and size are right but you want a different colour. This is one of the most common shopping questions and usually leads directly to a solution.
'La stessa cosa' means the same thing. 'In un altro colore' means in another colour. 'La stessa' agrees with 'cosa' (feminine). If referring to a masculine noun: 'lo stesso modello in un altro colore'.
Lo avete in nero?
Do you have it in black?
Asks for a specific colour.
Che colori avete?
What colours do you have?
Asks for the full range.
Esiste in blu?
Does it exist in blue?
Checks if that colour is made.
Italian fashion shops typically present collections in a limited 'palette' each season — usually 3–5 colourways per style. Asking 'che palette avete?' (what colours do you have?) invites them to show you the full selection.