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Edit Aug 25, 2013: I have included a You Tube video link on how to do the front and back post DC, you can find it here.
Edit Oct 13, 2017: I am excited to see that this is my most popular pattern to date. I was inspired to make this after seeing a vintage knitted slipper pattern. Many people have asked how to change the size of this pattern. I have not experimented with this pattern enough to truly know the answer, except try different yarn types, hooks sizes, and experimenting the amount of dc's in row 1. Speaking of row 1, if you know how to do the magic ring, you can do that instead of putting 14 dc into a single chain.
Edit June 17, 2021: I now have a video for these slippers:
This slipper has the front and back post dc's around the entire slipper. I think this gives the slipper a thick textured around the entire foot.
So here is my pattern for the ribbed slipper
One 6-8 oz (about 200 grams) skein Worsted Weight Yarn
Size g hook
FPDC = Front Post DC. You are doing a dc around the dc on the previous round, bring the hook around the dc from the front.
BPDC = Back Post DC. You are doing a dc around the dc on the previous round, bring the hook around the dc from the back.
Working in rounds for the toe.
Row 1: ch 4, 14 dc in 4th chain from hook, join with the 4th chain from the beginning ch 4
Row 3: ch 3, FPDC around next dc *BPDC around next dc, FPDC around next dc* repeat around, join with beginning chain 3
Note: You are doing alternating FPDC and BPDC for the ribbed effect.
Repeat round 3 until you have about 3 inches.
Now you are now no longer working in rounds.
Do one more round of row 3, but do not join with the ch 3, ch 2, turn
Row 4: BPDC around next dc, *FPDC around next dc, BPDC around next dc* repeat until reach the ch 3, hdc on top of ch 3, ch 2, turn
Row 5: skipping hdc, FPDC around next dc, * BPDC around next dc, FPDC around next dc* repeat until reach the ch 2, hdc on top of ch 2, ch 2, turn
Row 6: Skipping hdc, BPDC around next dc, *FPDC around next dc, BPDC around next dc* repeat until reach the ch 2, hdc on top of ch 2, ch 2, turn
Repeat rows 5 and 6 until you have desired length of slipper, usually until about the end of the heal, finish off.
Turn slipper inside out, sew up the back to form the heal.
If desired, do a row (or two) of sc's evenly around the opening of the slipper.