We will be all over Italy in the middle of October...
Any tips on what to bring to wear???

My husband and I are traveling with another couple. We are middle aged but young at heart.. lol
Casual

You're being too vague about where you're going, what you'll be doing and how long your trip is, but generally speaking wear whatever you would wear if you were sightseeing near your home. IMO, comfort before style.

If "all over Italy" includes mountain areas, you'll need a warm layer. If hiking, appropriate footwear. If seaside resort, you can take a swimsuit, but you probably wouldn't use it. You can buy a cheap umbrella if it rains, but I'd take a rain jacket. If you intend to enter churches, you'll need to be appropriately/respectfully dressed.

Pack light and assume you'll launder some clothes as you go. Most hotels have laundry service, or you can take to a local laundry or DIY.

No more long balmy evenings - sunlight (when you have it, rather than rain...) ends between six and seven, and it gets chilly. So you need a layer or two, but probably of the kind that looks kinda civilized rather than wilderness or alpine, since you'll be spending a lot of time indoors, hotel lobbies and restaurants etc. Unless you rent apartments wherever you go, which is a great way to do it at that time of the year - cozy "at home" with a fridge etc. Try www.housetrip.com for that, it worked great for us in many locations.

Jean has it right when it comes to wardrobe.

Italy is a mountainous country, and the temperatures in depend mostly on elevation. At sea level in southern Italy, you could find summery temperatures, while you could already encounter snow at high elevations. Without knowing exactly where you'll be, it's hard to give useful advice about wardrobe.

Probably long cotton slacks would be appropriate everywhere, coupled with a mix of short-sleeved and long-sleeved tops. I would bring at least one lightweight sweater and one heavy sweater. Definitely bring a wind-and-rain-resistant jacket with a hood, because rain is always a possibility, and it will keep you warm layered over a sweater.

Casual clothing is fine everywhere.

Thank you everyone...