When referring to a "fancy button" as a type of button used in clothing or as a decorative fastener, its characteristics in English can be described as follows:

‌Ornate Design‌: A fancy button typically features an intricate, elaborate, or artistic design that sets it apart from plain or standard buttons.

‌Material Quality‌: These buttons are often made from high-quality materials such as silk, satin, metal, glass, or even precious stones, contributing to their luxurious appearance.

‌Decorative Elements‌: They may incorporate decorative elements like embroidery, beads, sequins, or rhinestones to enhance their visual appeal.

‌Unique Shapes‌: Fancy buttons come in a variety of unique and often whimsical shapes, such as flowers, stars, animals, or abstract patterns, making them a statement piece.

‌Color Variety‌: They are available in a wide range of colors and color combinations, allowing for versatility in matching different fabrics and designs.

‌Size Range‌: Fancy buttons can vary greatly in size, from small and subtle to large and eye-catching, depending on the intended use and design aesthetic.

‌Functional and Fashionable‌: While serving their primary function as a fastener, fancy buttons also add a fashionable or decorative element to garments, accessories, or craft projects.

‌Durability‌: Despite their ornate appearance, fancy buttons are often crafted to be durable and long-lasting, ensuring they can withstand the wear and tear of regular use.

In summary, a fancy button as a type of clothing or decorative fastener is characterized by its ornate design, high-quality materials, decorative elements, unique shapes, color variety, size range, combination of functionality and fashion, and durability.