Free Pattern Step-by-Step Crochet

A light crochet hat with a treble crochet brim

A crocheted hat built from hdc rounds and finished with an open treble crochet brim.

Level: Intermediate
Time: 4-6 hours
Yarn: Worsted

Start with a loop and build the first hdc round straight into its center.
Work several increase rounds in half double crochet to grow the crown flat.
Level off with rounds worked even in hdc, no more increasing.
Turn to trebles and build the open brim with triple yarn-overs and skipped stitches.
Continue the treble and chain-1 pattern around to finish the brim edge.
Cut the yarn, weave in the tail, and spread the hat out to check its shape.

About This Pattern

This one lives in the summer-accessory drawer of my notebook, next to the plainer sc caps. It earns its spot for the brim alone. Most hat patterns stop at a tidy hdc dome. This one keeps going, adds a whole second act in treble crochet, and turns a simple crown into something with actual drape at the edge.

What comes out the other end is a soft, breathable hat with a solid fitted crown and a loose, lacy edge that moves. Alisa cotton yarn keeps it light rather than floppy. It reads as a warm-weather piece, not a stand-in for a winter beanie.

Worth knowing

The satisfaction here is in the contrast. The crown is dense, controlled hdc work with deliberate increases, so it grows exactly where you want it to. Then the pattern hands you a triple yarn-over treble stitch and a chain-1 gap, and the fabric opens right up. Getting that first treble round even, with the skips landing correctly, is its own small win. The single crochet rounds that curve the crown downward are quietly the cleverest part. They do real shaping without a single increase. Cotton yarn holds every one of those stitch definitions crisply, so the finished hat shows its own construction, crown to brim, which is a nice thing for a piece you'll actually wear.

Common mistakes

Losing the round in early hdc rows Mark the first stitch of each round before you start increasing. It is easy to lose track once the stitch count climbs.
Uneven crown curve Keep the single crochet rounds genuinely tight, tighter than your usual gauge. A loose sc round here won't pull the crown down properly.
Skipping a stitch out of place in the treble round Count carefully before each treble; the skip only works if it lands on the stitch the pattern intends. One missed skip throws off the whole repeat.
Triple yarn-over trebles pulling tight Keep tension relaxed through all three yarn-overs. A cramped treble crochet stitch shrinks the open brim you're trying to create.
Turning chain forgotten before the brim Remember the chain-5 and turn before starting the treble section. Without it the first treble round sits crooked against the crown.

Ruby

The story behind Stitch Obsession, and Ruby, who writes and tests every pattern on the shelf.

More Patterns

Intermediate

The kit

Crochet hook
Scissors
Needle
Alisa cotton yarn

Initial Setup

Round 1Create a loop with the crochet hook. Chain 2. Work 12 half double crochets into the center. Slip stitch to close the round. Chain 2 and turn your work.(12)

Increasing Rows (Rows 1–10)

Round 2Work 2 half double crochets (hdc) in each stitch around.

Round 3Repeat 2 hdc in each stitch around.

Round 41 hdc in the first stitch, 2 hdc in the next , repeat around.

Round 53 hdc, then 2 hdc in the next stitch , repeat around.

Rounds 6–7Work 1 hdc in each stitch around (no increases).

Round 84 hdc, then 2 hdc in the next stitch , repeat around.

Round 93 hdc, then 2 hdc in the next stitch , repeat around.Row 10: Repeat Row 9 pattern.

Single Crochet Rows (Rows 11–12)

Rounds 11–12Work 2 rounds of single crochets (sc) tightly to shape the crown.

Helps start curving the top of the hat downward.

Treble Crochet Rows

Treble RoundChain 5 to begin. Yarn over 3 times, skip 1 stitch, work treble crochet (tr) in next stitch. Chain 1, skip the next stitch, and repeat the treble crochet pattern around.

Alternating Rows

Alternating (sc)Work 2 rounds of sc.

Alternating (tr)Work another row of treble crochet as described above.Continue alternating: 2 rounds of sc followed by 1 round of tr.

Shaping the Hat

Rounds 1–4Work 4 rounds of sc.

Round 310 sc, then increase (2 sc in 1 stitch) , repeat.

Round 47 sc, then increase , repeat around.

Opening the Hat

Round 1Work 1 round of treble crochet, skipping 1 stitch between each.

Round 2Work 1 round of sc, increasing every 5 stitches.

Round 3Work 1 round of normal sc (no increases).

Round 4Repeat: 5 sc, then increase , around.

Round 5Final increase round: 7 sc, then increase , repeat.

Assembly

Step 1Cut yarn and weave in the tail using a needle.

Step 2Spread the hat out evenly to display the final result.

From the collection

A light crochet hat with a treble crochet brim — photo 2

A light crochet hat with a treble crochet brim — photo 3

Finishing

Cut the working yarn once the last treble round is complete and secure it.
Weave in the tail with a needle so it disappears into the wrong side of the stitches.
Spread the hat out on a flat surface to let the crown and brim settle into shape.

Why it works

The crown starts from a chained center loop and closes each early round with a slip stitch, which is what keeps those rounds flat and circular rather than spiraling.

Increases in the early hdc rows are spaced further apart as the rounds progress, from every stitch down to every third or fourth, which is standard math for keeping a circle flat as it grows.

The single crochet rounds sit between the flat crown and the treble brim with no increases at all, and their tightness alone is what pulls the top edge into a downward curve.

What it becomes

A warm-weather sun hat for gardening or walking, paired with a simple cotton tote.
A lightweight layer for a beach bag, worn over damp hair after swimming.
A porch or patio accessory, paired with linen clothing for a relaxed, textured look.

Original pattern: https://crocheteverything.com/breezy-summer-vibes-crochet-hat-tutorial/

FAQ

Is the treble brim worked in the round or flat?

It starts with a chain-5 and a turn, which suggests turned rows rather than a continuous round. That turn keeps the brim's tension even as it opens up.

Can I use a different cotton yarn instead of Alisa?

Any cotton of similar weight should behave the same way here. Cotton's structure is what keeps the treble brim crisp rather than sagging.

Why triple yarn-overs instead of a standard treble crochet?

A triple yarn-over treble is simply worked with three loops on the hook before you begin, taller and looser than a standard one. Combined with the skipped stitch and chain-1, it's what gives the brim its open, airy texture.