A644 Felt Mug Cosy

How to Sew a Felt Mug Cosy

Keep your drink warmer and make your mug more comfortable to hold with a padded felt mug cosy. The design wraps around the mug and fastens with a button, allowing it to fit neatly around the handle.

The cosy is made from two felt pieces with a thin layer of wadding inside. The shaped tabs overlap at the front and are secured with a button and buttonhole.

What You Will Need

Materials

• Felt
• Thin wadding
• Matching sewing thread
• One button

Equipment

• Fabric scissors
• Sewing machine
• Hand-sewing needle
• Dressmaking pins or clips
• Printer and A4 paper for the template
• Fabric-marking pencil or chalk

Pattern Pieces

Print the mug-cosy template from page 3 on A4 paper and cut around the outer line.

Cut:

• 2 mug-cosy pieces from felt
• 1 rectangle measuring 10 × 25 cm from thin wadding

Check the Fit

Mugs vary in circumference, height and handle size. Wrap the paper template around the intended mug before cutting the fabric.

The cosy should fit closely around the mug without pulling the tabs too tightly. The tab opening should sit comfortably around the handle.

To adjust the template:

• Extend the long sides for a wider mug.
• Shorten the body for a smaller mug.
• Lengthen the tabs where more overlap is required.
• Check that the button position remains clear of the handle.

Construction Overview

The mug cosy is made in five stages:

1. Cut two felt pieces and one wadding rectangle.
2. Secure the wadding to one felt piece.
3. Sew the felt layers together, leaving a turning gap.
4. Turn the cosy right side out and close the opening.
5. Add the buttonhole and button.

Attach the Wadding

1. Place one felt piece with its wrong side facing upwards.
2. Centre the 10 × 25 cm wadding rectangle over the main body section.
3. Keep the wadding away from the narrow fastening tabs to reduce bulk.
4. Pin or clip the wadding securely.
5. Sew a rectangle around the wadding to hold it in place.

Stitch close to the outer edge of the wadding so it remains flat and does not shift during assembly.

Join the Felt Layers

1. Place the two felt pieces together with their right sides facing.
2. Align the long edges, short edges and fastening tabs.
3. Pin or clip around the complete shape.
4. Mark a turning opening approximately 5 cm wide along one long side.
5. Sew around the shape, leaving the marked opening unstitched.
6. Backstitch at both ends of the opening.

Sew slowly around the corners where the main body meets the narrow tabs.

Trim the Seams

1. Trim excess seam allowance where necessary.
2. Clip the internal corners beside the tabs.
3. Trim the outer corners diagonally without cutting through the stitching.

Reducing bulk will help the tabs and corners turn neatly.

Turn the Cosy Right Side Out

1. Pull the cosy carefully through the 5 cm opening.
2. Use a blunt point-turner or the rounded end of a knitting needle to shape the corners.
3. Smooth the long edges and fastening tabs.
4. Check that the wadding remains centred inside the body.

Close the Turning Opening

1. Fold the raw edges of the opening to the inside.
2. Align them with the surrounding seam.
3. Pin or clip the opening closed.
4. Close it with a ladder stitch or a neat line of machine topstitching.

Optional Topstitching

Topstitch around the complete outside edge where a firmer, more polished finish is desired.

Keep the stitching even and close to the edge. Topstitching can also help hold the internal wadding in position.

Add the Buttonhole

1. Wrap the cosy around the mug and overlap the fastening tabs.
2. Mark the buttonhole position on one tab.
3. Make the buttonhole slightly longer than the button diameter.
4. Sew the buttonhole using the machine’s buttonhole setting or a close zigzag stitch.
5. Carefully cut the buttonhole open without cutting the stitches.

A small amount of tear-away stabiliser behind the tab may help keep the buttonhole neat.

Attach the Button

1. Wrap the cosy around the mug again.
2. Pass a fabric-marking pencil through the buttonhole to mark the matching button position on the opposite tab.
3. Remove the cosy from the mug.
4. Sew the button securely by hand.
5. Add a small thread shank if the felt layers are thick.

Fit the Cosy Around the Mug

1. Wrap the padded body around the mug.
2. Position the tab opening around the handle.
3. Overlap the fastening tabs.
4. Pass the button through the buttonhole.
5. Check that the cosy sits level around the mug.

The cosy should feel snug but should not require force to fasten.

Fit Check

• The top edge should remain below the drinking rim.
• The bottom edge should not interfere with the mug base.
• The handle should remain easy to grip.
• The button should not press against the fingers while holding the mug.
• The cosy should not slide down when the mug is lifted.

Alternative Fastenings

Replace the button and buttonhole where another fastening method is more suitable.

• Hook-and-loop tape – quick to fasten and adjustable.
• Press stud – creates a clean, low-profile finish.
• Elastic loop and button – allows a small amount of stretch around different mugs.
• Ties – suitable for a decorative handmade look.
• Magnetic snap – suitable only when positioned away from direct heat and used according to the manufacturer’s instructions.

Fabric Alternatives

Felt is stable, insulating and does not fray, making it easy to sew. Other materials can also be used with suitable preparation.

• Wool felt – naturally insulating and durable.
• Wool-blend felt – provides structure with a softer finish.
• Acrylic craft felt – affordable and available in many colours.
• Fleece – soft and warm, although it may stretch more than felt.
• Cotton canvas – suitable with finished seams and a separate lining.
• Quilting cotton – ideal for printed designs when paired with thin batting and a lining.

Wadding Alternatives

• Thin polyester batting
• Cotton batting
• Wool batting
• Insulated thermal batting suitable for sewing projects

Decoration Ideas

• Use contrasting felt for the two sides.
• Add decorative topstitching around the edge.
• Embroider initials or a short message.
• Add felt flowers or simple appliqué shapes.
• Use a decorative wooden or covered button.
• Add a small pocket for a tea-bag tag.
• Create matching mug and teapot cosies.

Care

Follow the care instructions for the chosen felt and wadding. Spot cleaning is generally the safest option.

When washing is permitted, fasten the button, use cool water and reshape the cosy while damp. Dry it flat and make sure it is completely dry before use.

Remove the cosy before reheating a mug in a microwave, oven or on any heating appliance.