As discussed in Hourglass Body Shape, women of this shape have Rounded shoulders, Bust, Hips and thighs with a very narrow waist.
Choose tops accentuate the shoulders and bust and at the same time takes the attention away from narrow waist. Peplum Tops, belted tops, tops with pre defined waist line works very well.
Hosiery / Stretchy materials will hug your curves so if you are okay with that then opt for those fabrics. if you are a plus size hourglass, then better to avoid this fabric.Also, avoid stiff fabrics, it will end up looking boxy. Soft fabrics like knit, soft cotton, silk and blend will gently drape over the body.
Fuller hourglasses / Plus size hourglass tend to look top heavy if the necklines are not kept in check. Opt for round, v necks. Avoid boat neck or fully covered necklines.
Avoid design details that add volume to your bust or hips.