I did pattern cutting for several years- its quite difficult and you have to be good at geometry and maths. The best thing I've got is a trouser block and a dress block which I drafted to my measurements , so in theory I can make any pattern I like. When I was doing the classes we would watch videos of designer fashion shows like Chanel, choose a dress or skirt or whatever, and then draft a pattern so we would know how it was constructed. We also did sewing couture techniques as well. You need quite a lot of bits and pieces, fancy rulers , French curves, dot and cross paper , notch makers etc. I did enjoy the classes though and learnt a lot. I rarely buy ready made dresses or skirts as I always look at dresses in the shops and think "I could make that" ( but rarely do!)