What equipment do you need for a skiing trip?

I'm going to combine all the good points into a single answer. Feel free to edit if something else comes up.

You will absolutely need:

• A ski jacket or other warm, waterproof, breathable jacket. Make sure at least one of the pockets can be zipped shut, so your car keys can't go flying down the hill when you fall.
• Ski pants or other waterproof, breathable pants
• Ski gloves or similar warm, waterproof gloves
• Warm boots suitable for walking in the snow
• Ski socks
• Enough clothing so that you can dress in layers under your outerwear. You will be cold when you are sitting on a lift, but hot when you are actually skiing
• plenty of t-shirts as you will get sweaty
• Sunglasses. Ski goggles are also necessary for cold days, but you can rent them
• lip balm and sunscreen
• warm hat. Even if you use a helmet you will need the hat for when you are not skiing
• travel documents as needed

Consider also:

• Something to protect your neck. A scarf works as long as it's always tucked in (getting a loose scarf end caught in something can be ugly). A turtle-neck sweater or a ski neck-protector is probably better.
• Your resort may have a hot tub, in which case bring a bathing suit.
• Something to do in case you can't ski one day
• A camera - but don't ski with an expensive one unless you are confident

Technically you might get away with a one-piece ski suit instead of the jacket and pants, but usually that only works if you are an extremely good skier or extremely good looking. :-)

Other essential equipment includes skis, poles and boots; and there are also helmets, which are increasingly recommended but not actually required for adults. All of these can be easily rented, and it is best to do so for your first ski trip, as they are expensive and will be no use to you if you decide you don't like skiing and never go again. Skis and boots are definitely best bought after you have skied a few times, and preferably somewhere that you can try them out.

You will be spending time outside and it will be cold. So hat, waterproof gloves, and a scarf are all important. Warm boots to wear until the point where you put on the ski boots. Possibly a balaclava (aka ski mask) if you're really feeling the cold. Also lip balm and sunscreen. Since you haven't skied before, you're likely to fall down, and if you're not experienced at choosing and arranging winter clothing, this may mean getting snow up your back or your pants leg. Taking slightly more clothes than usual will give you a chance to change into something warm and dry when you come off the slopes, for a more comfortable evening. Finally, make sure you bring a camera and pause for a minute at the top of the hill to take some amazing pictures. Most people get off the lift and immediately work on going down - enjoy the top for a bit, not everyone gets there.

In addition to the answers provided so far:

You will absolutely need to bring ski goggles. If it's sunny, you can use normal sunglasses, but if it snows you will need the goggles to keep the snow out of your eyes.

You'll be sweating quite a bit, since you're not that experienced yet. So, you'll need plenty of t-shirts.

The actual ski boots you can rent along with your skis, but you'll need a pair of reasonable sturdy shoes to walk around town. Furthermore, you also need special ski socks. These are far thicker and longer than regular socks. Count on two pairs at least, as you'll be alternating every day.

The main reasons you need a ski jacket is for the RFID slope card, which goes in the sleeve of your jacket, and the snow barriers around your waist and wrists (so you can quickly shake the snow out when you fall ;) )

A separate ID card isn't needed; a passport is already sufficient.

I think the most important items are already mentioned, but I want to add some more, in my opinion almost the most important:

Don't forget to protect yourself. At least a helmet is really necessary in my opinion. Even if you're a beginner and you only drive very slow, there are also others that can crash into you. I life in a ski resort and most scary accidents that I've seen were caused by a skier that was driving too fast and crashed into another one. So I would definitively protect my head. If you plan to go skiing regular in the future I would also think about a back protector. Broken vertebrae can literally ruin your life. I have two friend which both broke their back during skiing/snow boarding.

Besides that I'll just list what others have already mentioned and will add a little bit of information:

• Pants: I would invest in a good one. There are very cheap pants but those pants aren't waterproofed and it is really a bad feeling if you have to go skiing the whole day with a wet boxer shorts
• Jacket: Obviously you need a warm, wind resistant and water-proofed jacket.
• Sunglasses/Snow goggles
• Gloves: If you want warm gloves I would choose mittens.
• Socks: Don't use socks that are too thick and warm. Then you can't move anymore your toes and you will feel even colder than with very thin socks.

People tend to forget to bring the items they need for apres ski, or if they are unfortunate to get sick or a case of a sprained ankle. Ski resorts can be REALLY boring if you are not able to ski.

Depending on your group you should also consider bringing: boardgames, films, books, contraceptives, etc.

If you drive to your skiing destination, you could also consider bringing pasta, rice, etc That is if you don't want to spent much on buying food there.