rickrack

/ˈrɪkˌræk/
noun
  1. A narrow, zigzag braid used for trimming on clothing or home decor items.
    • She sewed a strip of rickrack along the edge of the pillowcase for a decorative touch.
    • You can find rickrack in most fabric stores in a variety of colors and sizes.
    • The vintage dress was trimmed with colorful rickrack around the collar and sleeves.