Skill level: Beginner/easy 

Using the smooth yarn, make a foundation chain of the required length, or work row 1 directly into the item to be trimmed with right side facing. 

(odd number of stitches) 

Row 1: (smooth yarn) 1 ch, 1 sc in each st or position to end. Fasten off, turn. 
Row 2: (fluffy yarn) 3 ch, *2 dc in next st, 1 dc, rep from * to end, turn. 
Row 3: (fluffy yarn) As row 1. Fasten off, turn. 
Row 4: (smooth yarn) As row 1. Fasten off.


ABBREVIATIONS / REFERENCES
Click for explanation and illustration

ch(s) = chain(s) sc = single crochet
dc = double crochet  

Trim directions reproduced by permission from 150 Crochet Trims by Susan Smith, St. Martin's Griffin, 2007