That word does not mean what you think it means.
slan·der/ˈslandər/
Noun: The action or crime of making a false spoken statement damaging to a person's reputation.
As "making a false spoken statement damaging to a person's reputation" also falls under the broader term defamation, one must also consider the fact or opinion standard as often used in legal matters. A statement contrary to document-able fact would indeed be defamation, or slander. However, opinions are not document-able fact. My statement regarding your unfortunate choice in attire falls squarely under opinion; I did not misstate color or shape or object worn. I simply deemed them to be horrible in my estimation. Therefore, as a statement of opinion it is not defamation or slander.
You have not been slandered. You may, however, require a dictionary.
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