ITT: Cosplay Sewing
Post any sites or resources you know that can help with sewing.

Looking over a lot of works there are always common elements to focus upon when designing a character work for making a costume.
Such as;
Piping along seam edges rounded or flat.
Contrasting color visible stitch lines.
Covering buttons for singular smooth color, while still maintaining function.
Sewing pleather or vinyl decorations.
Pleating and folds.
Learning the materials that can give the project the right feeling.
Pattern adjustment to sizing.
Buckles, pouches, straps, zippers, etc.

Any other ideas on areas to focus, also welcome.