The most important part is a good pattern. I already showed in this post how to chose a pattern or take one of your existing corsets. You can also buy a pattern like one from Laughing moon. Be sure that you chose the correct size here, at last the patterns from Simplicity are designed with fitting ease which absolutely makes no sense with corsets. You should measure the pattern pieces and calculate about a 10cm reduction from your normal/natural waist circumference.
The next thing you will need is a fabric. Or rather several fabrics. You will of course already have one fabric in mind - the upper/outer fabric. You will not need much, about 50cm with fabrics that are 1.2-1.4m wide is enough for most corsets. But you will also need a stabilising fabric (50cm at least, if your outer fabric is thin better 1m) and a cotton or silk lining. Since the lining will be worn towards your skin, you should prefer a natural fabric here. The stabilising fabric is necessary to prevent the corset from stretching over time. You can use strong jeans fabric or coutil.
|from left to right: Pattern, outer fabric (navy satin), stabilising fabric 2x (navy coutil), lining (cotton)|
I just assume that you will already have the basics at hand (scissors, needles, pincers, measuring tape, needles, matching thread and a sewing machine or a lot of patience). The first thing you need to do is to draw the pattern pieces onto your fabric with 1cm seam allowance (for this sewing method, you will need 1.5cm for others!). You will need to outline the pattern with chalk or pen on each piece because you will need the seam lines later on. The last step for today I to cut all the pieces. Repeat for all fabrics and you will end up with with this: