When multiple adjectives describe a noun, English speakers instinctively follow a specific order. Getting this order wrong doesn't make your meaning unclear, but it sounds unnatural to native ears. The order is: Opinion → Size → Age → Shape → Colour → Origin → Material → Purpose + Noun.
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The OSASCOMP Order
The standard adjective order in English is: Opinion (lovely, strange) → Size (large, tiny) → Age (old, new) → Shape (round, square) → Colour (red, blue) → Origin (French, wooden) → Material (cotton, metal) → Purpose (sleeping bag, running shoes). A useful mnemonic: OSASCOMP. You rarely use more than three adjectives at once in natural speech.
Cumulative vs. Coordinate Adjectives
Cumulative adjectives follow the OSASCOMP order and do not need commas: "a beautiful Italian leather sofa". Coordinate adjectives are of equal importance (often both opinions or descriptions) and require commas or "and": "a hot, humid day" or "a hot and humid day". To test: if you can reverse the adjectives and the sentence still sounds natural, they are coordinate.