Какой размер этой рубашки?

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Breakdown of Какой размер этой рубашки?

• рубашка: the shirt
• какой: what
• размер: the size

Questions & Answers about Какой размер этой рубашки?

Why does the sentence start with Какой, not Что?

Because какой means which / what kind of, and Russian uses it when asking about a category or type.

Here, размер is not just any random thing; it is a category with possible values like small, medium, 42, 46, and so on. So Russian asks, literally, Which size is this shirt?

Using что would sound wrong here, because что asks what? in a more general sense.

What does each word mean in the sentence?

• Какой = what kind of / which
• размер = size
• этой = of this / this in a form that matches the noun it describes
• рубашки = shirt in the genitive singular form

Word-for-word, the structure is close to:

What size of this shirt?

Natural English does not say it that way, but that is how the Russian grammar is built.

Why is рубашки not рубашка?