If you use a century designation as an adjective please hyphenate it.
It looks like this: seventeenth-century jordans
Hyphenation still applies if you write the century numerically: 17th-century jordans
If you’re able to be more specific you’ll need another hyphen: mid-seventeenth-century jordans
But there’s no hyphen if you’re referring to a time period: jordans in the seventeenth century