Any items offered in the Marketplace contain compatibility information regarding the software version required for use. Any clothing listed as G5, G3 or G2 can only be used with older iClone characters and not in CC.
It's best to read the product description before making a purchase, not only for the software version but also to see if any Base content is required as well.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.