What do bikinis cost more than women's jeans?

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A random sampling of bikinis and women's jeans on Amazon shows that bikinis and women's jeans, on average, each cost about about the same US$30. A Google search also shows that some bikinis cost around US$50, with some as high as US$500. The most expensive jeans I found (ignoring any gemstones) was US$100.

Why is that? There is a lot less material in a bikini than in jeans, and about the same amount of sewing in each.

Note: This question is prompted by a discussion I had the other day with a female friend, who was preparing for a vacation trip to warmer climates.
What do bikinis cost more than women's jeans?
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