Materials you’ll need:

Crochet hook (appropriate size for your chosen yarn)
Worsted weight or bulky yarn in your desired color
Scissors
Yarn needle

Instructions:

Measurements: a. Before starting, take your measurements for the bust, waist, and hips. This will help you determine the size to crochet and ensure a good fit.
Back Panel: a. Make a foundation chain with a length equal to the desired width of the back panel (typically based on your bust measurement). b. Starting from the second chain from the hook, work in your chosen stitch pattern (such as double crochet or half double crochet) until the panel reaches the desired length (typically based on your desired pullover length or the measurement from your shoulder to the waist).
Bobble Stitch Pattern: a. Choose a stitch pattern for the bobbles. The most common bobble stitch is made by working multiple double crochets together in the same stitch. b. Follow the pattern to create the bobbles. Typically, you will work a specific number of double crochets in the same stitch, then secure them together with a single stitch, such as a slip stitch or single crochet.
Front Panel: a. Repeat the same steps as the back panel, making sure to match the width and length. b. However, you may want to create a neckline by skipping a specific number of stitches in the center of the foundation chain (this will vary depending on the desired depth of the neckline) and then working the stitch pattern on each side of the skipped stitches.
Sleeves (make 2): a. Make two separate panels for the sleeves. b. Determine the desired width of the sleeves (typically based on your upper arm circumference) and work in your chosen stitch pattern until the panel reaches the desired length (typically based on your desired sleeve length or the measurement from your shoulder to your wrist). c. You may want to gradually decrease or increase the stitch count at the beginning and end of each row to shape the sleeves.
Assembly: a. Lay the back panel and front panels together, with the right sides facing each other. b. Seam the shoulders using a whipstitch or mattress stitch, leaving openings for the neck as desired. c. Seam the sides of the pullover, leaving openings for the armholes. d. Seam the sleeves to the armhole openings, ensuring that the seams align with the shoulder seams. e. Weave in any loose ends using a yarn needle.

Remember to adjust the size, stitch pattern, and other details based on your preferences. This pattern provides a basic structure for a crochet bobble pullover, and you can modify it by incorporating different stitch patterns, color changes, or additional design elements to make it uniquely yours.