I can't find any information about appropriate attire for Alfredo's in the Italian pavillion at Epcot. Has anyone been recently?

There is no "proper" attire for most restaurants in WDW, particularly those restaurants located in one of the parks. Most of your fellow diners will be wearing shorts, sneakers and casual shirts. Of course if you wanted to dress up a little more you wouldn't look out of place in a casual dress/slacks/capris etc.

WDW doesn't expect park guests to go back to their hotel to dress for a dinner back in the park. What ever you are wearing is fine.

We were there pre Christmas one year and ate at Alfredos. It is delicious by the way.
We wore slacks because it was a cool night. I think nice shorts in the heat are fine also. Call WDW dine and see if they have a dress code. I don't believe they do. Like the above posters said it is a theme park.

"Call WDW dine and see if they have a dress code."

Let me save you a phone call. Their dress code is essentially everyone needs a shirt (men as well as women) and all need to wear shoes (although flip flops are fine too and not the least been unusual there). As well stated above -- anything you'd wear in a theme park is what is worn at the restaurants in the theme park. If you want to really look and fell silly, dress up with ties and jackets.

White tennis shoes or sandals and socks, hawaiian print shirt, shorts, fanny pack, safari hat, camera hung around neck.

Seriously, whatever you are wearing to the parks that day.

Actually I pretty sure its a requirement that you wear at least one item of clothing with a Disney character on it. It must be a rule judging from all the people I saw wearing Mickey hats, Mouse Ears, Goofy hats, Minnie T shirts.

I think you may be overestimating Alfredo's. While it is certainly a step up from the usual Disney fast food - it is nowhere near fine dining. If it were anyplace other than Disney the food would be rated mediocre at best. I heard it compared to Olive Garden - but dont know since I've never been to OG.