Wear this hat to the LUG, the office, or your next trip to Fry’s. When someone tries to out-geek you, point out that the stripes in your hat say “HAT” in binary.

Pow – you win!

Instant Download of a printer-friendly Adobe PDF pattern. This version includes:

  • Clearer instructions
  • More technique information
  • Better layout
  • No blog clutter on the sides of the page
  • The addition of a proper chart for working the stripes (for you chart lovers)

Only $4.95!

Click here to buy it.

Update: the pattern is also for sale at Patternfish.

Gauge: 4 stitches, 6 rows / inch
Yarn: Cascade 220 in 8400 and 8401 (or yarn of your choice – do I even need to say that?)
Needles: 5mm circular needles

Instructions given are for an average female head (20-22 inch circumference), with instructions for an average male head (22-25 inch circumference) in parentheses.



Comments (0)


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  1. Very cool idea. Thanks. :)

    Comment by Micky
    April 18, 2006 @ 7:48 am

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  2. Brilliant!

    Comment by lla
    May 8, 2006 @ 6:07 am

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  3. That’s so cool! I’m going to have to make one of those!

    Comment by Hilari
    May 13, 2006 @ 12:35 pm

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  4. Supper Geeky. I love it!

    Comment by Drhaggis
    July 15, 2006 @ 4:08 pm

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  5. [...] chet, or sew. However, one of the sites that I have been reading lately has linked to the Binary Hat. Basically, the site gives a description of how to make a hat that encodes the word “h [...]

    Pingback by Experiments in Life » Blog Archive » Binary Hat
    September 16, 2006 @ 8:26 am

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  6. I googled “binary code” and got all the letters. I am making my teenage sons hats with their names in binary on them, in the same stripe patterns. Love the idea of doing binary, and love being able to personalize the hats with names!

    Comment by Polly —
    November 30, 2006 @ 11:45 am

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  7. so clever!! and perfect for my mathmetical technie geek of a husband:)

    Comment by Cristina
    January 10, 2007 @ 11:05 am

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  8. My sister Susan knitted me one of these with a slightly different message. I’ve posted it and a link to your site on MovableBeast.com.

    Comment by Steve
    January 25, 2007 @ 4:00 pm

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  9. [...] My sister Susan is a knitting fanatic as well as a fan of Apple, so when she told me she was making me a binary hat my first thought was “huh?” But then she explained that it’s a knitted cap that features a pattern that is ASCII code that has been converted to binary, then knitted with one color representing a zero and another color representing a one. [...]

    Pingback by Movable Beast » Binary Hat
    January 25, 2007 @ 4:50 pm

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  10. The geek husband would love this pattern.

    Inspired!

    Comment by Karen
    February 3, 2007 @ 2:45 pm

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  11. [...] Binary Hat from Redshirt – it just looks like a stripey hat, so only you will know that the stripes encode “hat” in binary.   del.icio.us this! [...]

    Pingback by Photography Blog Site » Textiles
    June 19, 2007 @ 4:58 pm

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  12. [...] Binary Hat from Redshirt – it just looks like a stripey hat, so only you will know that the stripes encode “hat” in binary. [...]

    Pingback by Music and Songs » Textiles
    June 19, 2007 @ 6:28 pm

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  13. [...] Idéen med dem var, at der rent faktisk står ordet “taske” i bunden. Uden jeg kan gå nærmere ind på det (da jeg ikke rigtig er inde i det) fungerer det på samme måde som The Binary Hat. Det er ordet “taske” oversat til binære tal. Prøv f.eks. denne side, hvis du vil gøre noget lignende selv. Hvert bogstav i ordet har en kode, der består af ettaller og nuller. F.eks. hedder T “01110100″. [...]

    Pingback by Powerkitty » Mitred Stripes Tote
    June 20, 2007 @ 11:32 am

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  14. [...] The second is the binary hat in red and grey that I knit for my friend who’s a geek like me and thus would think this is hilarious. [...]

    Pingback by Yay Knitting! » Blog Archive » FO: Bunny Hat, Binary Hat, Cable Hat
    October 18, 2007 @ 1:14 pm

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  15. [...] I made Marcus a hat which spells out “H-A-T” in binary code. I used this pattern for the basic hat and charted out the three 8-unit letters of the code. I may make some more even though I used Red Heart yarn which was not my favorite to knit with. It did have the perfect colors, though! And it fit and he likes it, yay!!!! [...]

    Pingback by Welcome to our site!
    December 29, 2007 @ 1:34 pm

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  16. [...] And if you’re looking for a way cool cable scarf, take a look at the Secret Admirer Scarf. I like this binary pattern way more than the Binary Hat and this other Binary Scarf. The scarf on Knitty looks cool, but OMG, it would take me forever to knit with 2 colors. The hat has its limitations in how long your message can be because you can only go down so far in yarn thickness to squeeze everything in before the hat becomes too long. The example in the pattern to spell “hat” is in lowercase. You can refer to this chart if you want to spell “hat” in uppercase or you can refer to it if you want to compose a different message. The only thing I would omit in the hat pattern is the “checksum”. I think I like the Secret Admirer Scarf more because I like cables (had you noticed?). And I do like how she represented the letters as 5 bits instead of 8 bits. Makes it possible to do the scarf in worsted weight yarn. With 8 bits, you’d have to cast on 60 stitches which would make a very wide scarf in worsted weight yarn or you would have to bring it down to fingerling weight yarn to compensate on the width. —- [...]

    Pingback by Twisted Ropes | knittingclub
    March 29, 2008 @ 11:36 am

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  17. I was looking for a hat on Ravelry to knit for my hubby to wear at night when we camp. I came across this hat and I said, “Oh, isn’t that funny! This hat spells ‘hat’ in binary!” Being a software manager, hubby got sooooo excited and said “That is the hat you are going to make me! That is the coolest thing ever!” So when I asked him if he would actually wear it if I spent the time to make it, he responded, “Are you kidding!? I’m going to wear it all the time!” He is such a goof. So thank you for making a hat my hubby will actually wear!;-)

    Comment by janel
    April 15, 2008 @ 5:44 am

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  18. You’re most welcome!

    Comment by Erika —
    April 16, 2008 @ 9:05 am

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  19. [...] The Binary Hat: a stripped hat spells words in binary by using a color for 0 and another for 1. [...]

    Pingback by Making Math with Yarn | Hook and Needles: Knitting and Crochet Blog (cool stuff, techniques, and things I find)
    June 7, 2008 @ 9:32 am

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  20. [...] The Binary Hat: un sombrero a rayas que deletrea palabras usando un color para 0 y otro para 1. [...]

    Pingback by Matemáticas y estambre | Gancho y Agujas
    June 7, 2008 @ 9:40 am

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  21. [...] [...]

    Pingback by Free Knit Hat Patterns « Heidilogic, The Blog
    September 12, 2008 @ 7:48 am

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