[Solved] Joint position issue with fitted mesh rig

[200OK]

I've got this character I want to upload as a character rig. I'm however struggling with her pose?
For some odd reason her arms are up in the air, and her hips slightly more apart.

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However, in Blender, she looks fine.

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 I'd love some assistance, I've been searching for hours.

[200OK]

I'd also like to add that changing her resting pose to a T-pose doesn't work. It just makes her arms go even higher in the air.

 

Edit:

I stand corrected: This was the problem, I had just worked it out wrongly the first attempt.