Your "class" (ie job, whereas elf is a race) can help you determine your garb too. Hunter? Wanderer? Soldier? Mage? Commoner? If you do internet searches, think of using words besides "costumes," 'cause that'll get you the chintzy stuff rather than authentic. Class based garb, too, can be altered to look elven. Flowing embroidery, slanted angles on tabard panels, intricate motifs on armor.
And beyond that, there are many types of elves. Typically, they are tied to the land. Desert, plains, jungle, deciduous forests, swamp. You can do your own research on colors, fabrics, and types of garb for those environment as further inspiration.
Be compassionate and fearless in all that you do.
"Dagorhir is not a game of tournaments and established pecking orders...[it's] A game where any honourable, considerate person can fully enjoy themselves and be made welcome regardless of their athletic abilities." ~Aratar