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Flattened Shell Hat

Design by Marie Segares/Underground Crafter.

Flattened Shell Hat by Marie Segares/Underground Crafter
Flattened Shell Hat by Marie Segares/Underground Crafter

This pattern is designed to fit the following: Newborn (Infant, Adult Small, Adult Large). Photographed sample is size Adult Small.

A simple shell pattern combines with a self-patterning yarn to make an easy striped hat.

Skills Used

  • Basic crochet stitches: chain, double crochet, single crochet, slip stitch
  • Crocheting in the round
  • Skipping stitches, crocheting in chain spaces, crocheting in the back loop only
  • Increasing and decreasing with sc2tog (with written instructions in pattern)

Finished Sizes

  • Newborn: 13.25” (33.5 cm) hat circumference x 5.25” (13.5 cm) height.
  • Infant: 16.5” (42 cm) hat circumference x 7” (18 cm) height.
  • Adult Small: 19.5” (49.5 cm) hat circumference x 8.5” (21.5 cm) height.
  • Adult Large: 22.75” (58 cm) hat circumference x 9.25” (23.5 cm) height.

Gauge: Through Rnd 4 = 4.25” (11 cm) diameter in pattern. For best fit, always check your gauge.


  • Cascade 220 Superwash Wave yarn (100% superwash wool, 3.5 oz/100 g/220 yd/201 m) – 1 (1, 2, 2) skein(s) in 107 Boston, or approximately 115 yd (185 yd, 265 yd, 335 yd)/105 m (169 m, 242 m, 306 m) in any light medium weight yarn.
  • US Size H-8/5 mm crochet hook, or size needed to obtain gauge.
  • Yarn needle.

Skill Level: Easy

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