Absolutely! I can guide you step by step on how to make simple, seamless-soled slippers from leftover yarn. This method is perfect if you want cozy slippers without complicated sewing. I’ll assume we’re working with crochet (though I can also give a knitting version if you want).

Materials Needed
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Leftover yarn (any weight works, but thicker yarn makes sturdier slippers).
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Crochet hook (size suitable for your yarn; check the yarn label or slightly smaller for a denser fabric).
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Scissors.
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Yarn needle (for weaving in ends).
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Optional: Non-slip fabric paint or felt for the bottom if you want extra grip.
Step-by-Step Instructions: Seamless Sole Slippers (Crochet)
Step 1: Make a Slipknot & Start the Sole
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Make a slipknot and chain a small foundation chain, about the length of your foot.
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Example: For women’s small/medium, chain ~12–14.
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For larger sizes, chain ~16–18.
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Step 2: Crochet the Sole in One Piece
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Round 1: Work single crochets (SC) along the chain. When you reach the end, instead of turning, work along the other side of the chain back to the start.
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At the beginning of the chain, make 3 SC in the same stitch to curve the tip of the slipper. This rounds off the toe without seams.
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Round 2+:
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SC all around, adding increases at the curved ends (usually 2 SC in one stitch at each end) to keep the shape flat.
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Keep working until the sole matches the length and width of your foot.
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Tip: You can try it on as you go for a perfect fit.
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Step 3: Build the Sides
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After the sole is done, start working in continuous rounds (no turning).
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SC around the edge of the sole to begin building the sides.
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Work 4–6 rounds (or more if you want taller slippers) to cover the sides of the foot.
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For a snug fit: You can decrease a stitch or two at the heel.

Step 4: Optional Upper Foot Cover (Instep)
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For a closed slipper, you can crochet across the top of the foot:
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Decide how much of the top you want covered.
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SC back and forth in rows from one side to the other.
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Then continue working SC around the edge to join back to the sole, keeping it seamless.
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Step 5: Finishing
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Fasten off the yarn.
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Use a yarn needle to weave in all ends securely.
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Optional: Add non-slip grips to the sole with fabric paint or cut felt glued to the bottom.
Tips
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Thicker yarn makes sturdier slippers, thinner yarn gives a softer slipper.
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Stretchy fabric: You can mix two yarns for extra softness.
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Custom fit: Try the slipper on your foot as you go. You can adjust width and height.
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No-seam advantage: Crocheting in continuous rounds avoids a seam, which often irritates the sole of the foot.

✅ End Result: You’ll have a simple, cozy, seamless slipper perfect for lounging, made entirely from leftover yarn!
If you want, I can also draw a clear diagram showing the sole shape and how to crochet around it—it makes following this method much easier.
Do you want me to do that?
Watch video: