The correct Possessive word to fill the sentence is:
Possessive words in Spanish.
These words are used to mention that a noun belongs to another noun, they are usually located at the end of a sentence, since those that are located in other positions are possessive adjectives.
These possessives have both gender and number that must agree with the gender and number of the noun to which they refer, in the case of "vestido," this is a male and singular noun, for which the adjective of the same characteristics must be used which is "mío."
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