I love the glowing nature of the Sylvari. I prefer looks that show off that unique aspect of the Sylvari. The whispers armor, and gloves fit that idea perfectly.
Also, the cultural armor of the sylvari are unique amongst most other armor, which is why it can be hard to tie it in with the other armors in the game. I feel by mixing it multiple pieces of the sylvari cultural armor you can make it feel more natural when trying to tie it together with leather armor.