This is my first cosplay thread so I hope this is the right place to ask!!

I wanted to know if someone had tips for a Eureka SeveN Cosplay... I wanted to cosplay as Eureka... But because im a beginner its sort of complicated for me! And I do everything by hand! But its all for next year so time isn't an issue for me!
I wanted to know how to make the dress or any style of making the dress......
Boot covers I can handle......

Anything would help me at this point!!

Thank you very much!!^^