In case you missed it, JIMMY KIMMEL told parents to dress their kids up in embarrassing outfits for the first day of school, then record their reactions.

He aired a bunch of them on Tuesday's show, but also posted it on YouTube.  One woman put her son in a t-shirt that said, "I'm So Gay."  And another set of parents told their kids they had to wear a BURLAP SACK.

Here's the video, and you can also search for it at "YouTube Challenge -- I Got My Kid a Horrible Back to School Outfit."