Every challenge (except the ones with the blue “Dresscode-free” tag) has a certain amount of Glamour Points requirements. Glamour Points are the minimum required value of unworn items in a look in order to submit it. Glamour Points can be accumulated by buying new items, using owned but not used items, or renewing owned items in your look.
For example, if a challenge has a tag of 400 Glamour Points, the values of the items in your look should add up to 400 gems, coins, or gems & coins to complete it. You can reach this amount by purchasing new items or renewing the old ones. The amount you pay to renew the old items will count as Glamour Points.