Depends on your level, but id recommend rune + and a rune or better weapon, depends what you killing them for, if it for the staff I'd recommend those and few lobbies.
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The Left Skull Half is dropped by Ankous on the fourth level of the Stronghold of Security.
Fight Ankous in the Barbarian Stronghold (west of varrock)
In RuneScape there are usually no gender-related restrictions, i.e., a girl can wear anything a boy can wear. The real restriction for "elite" stuff is that it is members-only.
no XD
The best thing to wear in runescape for non-members is usally nothing or something light that offers some protection and for members will be some special event clothes with boots of lightness.