Sorry for writing one reply after another, but I've got some really useful information. I want to share it with you, in case someone would like to sew the costume on there own, too.
Here is a good video with sewing basics
Here is a comparison of sewing machines, if you are looking for one You are not allowed to view links.
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LoginAnd finally a nice forum with some useful tips and tricks on making costumes You are not allowed to view links.
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LoginI hope it would be useful.