Look at it on a "flat" plane from the front. The tiara is flat on 'toon-Glimmer's face, so [deliberately mis]read the "helmet" as a flat tiara, and you end up with round-topped straight, loose hair.
[I didn't say it was identical, but given the toon's interpretation of the "Double Trouble tiara", a bad reference pic could lead to that conclusion...][/QUOTE]
Yeah, I can see that. It's weird though. Maybe they purposely combined the designs and got the Glimmer we saw in the cartoon?
She has no cape, black hair. It's just weird.
Anyway, here's the final Double Trouble toy. Her helmet is different from the prototype with an added necklace: