Good enough for me, thanks for the answer!
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I think they'd at lest have to be taught the skill to "glam" 1st, since we had to, & that at lest by the quest's lv requirements they'd have to be lv50 to even learn it... have we even seen a bandit above lv50 that ant in Heavensward zones? and since ishgard was isolated from outsiders till past 2.55 story it would be rare for anyone in those area's to know the skill
Judgeing by Rowena's reaction to the "glam" teacher the skill seams like more of a rarity then we'd like to believe (more widely know in the past due to Diadem gear, but lost to time since its rare now)
Glamour due to its rarity sounds more like a skill the Rich & high lv assasin/theives would have lore wise due to nessesity/visual needs (gota look great for that ball or hide to get past security with all these weapons)