To crochet a hoodie, you need to know how to crochet, and be in possession of a crochet hook and yarn. You also need a crochet pattern for the hoodie you want to create.
The size of hook and amount of yarn you need is dependent on what your pattern specifies. Your pattern indicates the weight and amount of yarn needed for your project. Different sizes within a pattern require different amounts of yarn. A hoodie for a baby requires much less yarn than a hoodie for an adult. The color of yarn you choose is solely up to you.
Before actually beginning your hoodie, you should crochet a gauge swatch. This means creating a swatch of crocheted fabric using the specified hook and yarn from the pattern to ensure you receive the same number of stitches and rows the pattern indicates. If your swatch is too big, you need to use a smaller hook. If your swatch is too small, you need to use a larger hook.
If you don’t know how to crochet, you can learn by taking a class, reading a book, or watching videos that instruct you step-by-step. Videos are also helpful if you’re an experienced crocheter but need help learning unfamiliar stitches or techniques.
If you’re in need of a pattern, there are sites that offer them free of charge. You can also find them in books at the library.