you know the scenario: it's 3 am, your newborn has just puked on his last clean hat, you have a pile of old T shirts from when you were punk rawk, a serger, and 15 minutes, you're wearing sunglasses, and drinking from a jelly jar. time to get crafty, keep the child's head warm, and reduce the stockpile of old T shirts.

what you'll need:
1 T shirt
some paper
pair of shears
serger (a sewing machine with a step zigzag will also do, but is not shown here)
a tape measure
a pen.

let's get started

Step 1: Create the Pattern

cut out a pattern on paper as shown here. in this figure, the squares have 1 inch side. pay particular attention to the width of the hat. it should be half the circumference of the head plus 2 seam allowances (SA), which would be about half inch each. this depends, somewhat, on the stretchiness of the T shirt material, or the compressibility of the child's head. I used a width of 6 3/4*  use the tape measure to measure the circumference of your child for that bespoke fit.

the height of the hat should be more or less fixed. one can see, faintly, a fold line drawn on the pattern here, at about 2 1/4 inch from the bottom line. the lip of the hat will be folded inwards.

you can be creative and add more 'spikes' or make a 'mohawk' hat as well from this basic pattern.

* using the time-worn rule that the cervix has to be 10 cm dilated, using 2.5 cm/inch, and assuming my child was just born (more or less true), we can back out a value of pi to 1 significant digit.

This is fantastic! Thanks. Yes, I definitely had my share of rocker t-shirts but from the 80s..those good 'ol 80's hairbands..lol. Nice instructable.
1st: Awwwwwww! Sweet baby!<br /> 2nd:&nbsp;Thank you &quot;sew&quot; much for making this. I bought a serger from a garage sale - never used one before. This would be a good&nbsp;first project.<br /> 3rd: Awwwww! Cute Baby!!!!

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More by shabbychef:make a child's sleep cap from an old T-shirt 
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