Aela the Huntress won't equip Dragonscale Armor when I sell it to her in Skyrim the PC version, please help, how do I fix this issue???

Sold it to her for gold, or told her to follow you, then traded items with her? There's a different outcome, but if the latter then idk, never did use her as a follower if I didn't have to.

Did you give her the helmet first and no other armor? I hear some followers refuse to equipt armor unless u get them to equipt the helm first, then they equipt the rest of the armor.

No, just the armor, gauntlets and boots Dragonscale I gave to her.