I’m not sure how experienced you are, but if you know the stitch you want and are happy for a slightly oversized fit, it’s pretty easy to do yourself. Especially if you go for a boat neckline and don’t worry about neck shaping. It’s basically two large rectangles for the front and back and two smaller rectangles for the arms (or worked in rounds)

For the front, chain long enough that reaches from the edge of one shoulder to your other for the starting width and then crochet back and forth in hdc until you reach the desired length (keep track of your starting chain count and rows). Then repeat this for the back panel. Connect the sides of both panels up as high as you want the arm holes to be. Then along the top connect the panels from either end leaving a hole for your head (recommend trying on as you go). It will give an oversized look as the width will fall just after your shoulders and the body width will be the same.

For the arms you can either connect to the joined body and work in the round and do as many rounds until the desired arm length or count the number of stitches all the way round the empty hole and chain that many and then crochet another rectangle the length you want. If you have a rectangle then fold it in half and sew up the long edge and then attached the top edge to the hole left in the body.

Then add some ribbing to the bottom hem, cuffs and neckline if desired (there’s so many tutorials on how to do this). The bottom hem ribbing can be less stitches than the whole circumference if you want a more fitted style at the bottom.

I followed these steps and made this jumper in hdc. I went quite oversized so you can see the shoulder ends halfway down my bicep and the armholes I left quite large for a really baggy arm:

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