Substantial is a term used in jewellery referring to jewelries that is either large, heavy or laden with gemstones.

In the context of fashion, the term "substantial" can be used to describe a garment or accessory that is made from high-quality materials, or that is well-constructed and durable. A substantial piece of clothing might be heavier or more substantial in weight than other similar items, and it might be made from materials such as wool, leather, or heavy-duty synthetic fibers. A substantial garment might also be one that is well-lined or has additional layers or details, such as padding, quilting, or embellishments, which add to its weight or feel. Some examples of substantial garments or accessories might include:

The specific characteristics of a substantial garment or accessory will depend on the materials and construction used, as well as the overall design and aesthetic of the piece. A substantial garment is likely to be more expensive than one that is made from lower-quality materials, but it is also likely to be more durable and long-lasting.