Do they look just like chef hats? No.
They kind of look like there is a chazan/pope thing going on, but who cares, cause the kids are happy.
And this is what we did.
1. Cut construction paper into thirds, lengthwise. Use two of the strips to make a crown the size of your child's head. Staple the strips to make a striaght line. Just don't staple it into a round crown shape yet because first they will color the strips. This took a good half hour as they drew pictures of all the foods that a chef can cook. This is very good.
4. Put the hat on the kid's heads and kind of push the tissue paper down and then back up in a poofy chef hat manner. This is where the chazan/pope look comes in. (One kid insisted that his colored strip go on the inside, but only insisted this after I taped the whole thing together. This kind of worked out well because now you can see what the hat looks like inside out).