When I later learnt about how much work went into getting those meticulously styled and arranged hairdos I was a little apprehensive, but the end result is definitely worth the work!
Now, the hair of the 40's and 50's is very similar but these are some of the hairstyles that were widely used in the 40's.
Curls
Curls, curls and more curls was the way to do it back then. Whether you had big wavy curls cascading down your shoulders or little fluffy curls framing your face it gave instant elegance, and the variations were endless. All the hairstyles in this post involves curling the hair in some way.

In order to get those glamorous curls that lasted for days it was quite normal to go to a hairdresser several times a week for a set. For many it was a perfect occasion to catch up with friends, for what's a better place for a chat than under a hair drying helmet?
Those who tried to achieve the look in a more economic manner could do the sets themselves at home. By putting your hair in pin curls or rag rollers for the night you woke up with beautifully curled hair, all ready to style however you liked.

Victory Rolls

Victory rolls is no doubt the most iconic hairstyle of the 40's! I think it was so popular because it was a practical way to keep hair away from the face but at the same time look really glamorous.
The technique in making them can be quite tricky, but on the other hand, when secured it is a truly lasting style.
As you can see, there are many different ways to wear victory rolls: 2 big symmetrical rolls at the front or one large and one small, letting the rest of the hair hang loosely or roll it up into another roll. The possibilities are endless, once you've mastered the technique. (Which I still haven't)
Updos

Practicality was something that really characterised updos of this time period.
This rather popular style was usually made by tying a ribbon around the head and then folding all the hair inside it. By using a bigger ribbon it could easily become more festive.

And here's a modern twist on rolls. As you see, many different expressions and looks can be achieved.
The Rosie

Rosie the Riveter was quite a cultural icon during the war, representing the working women of America, and used to boost the morale. The hairstyle depicted on the poster was used a lot, partly for security reasons and partly because covering most of your hair with a scarf was a great way to hide greasy hair, in a time where water conservation was prioritised higher than frequent hair washes.

There are many modern takes on the hairstyle around today. I like this variety where the scarf is more a decorative bandana and the curls are shown off. (Tutorial for this particular style here)
A completely different way to use ribbons was simply using it to tie the hair back. It quickly created a sweet and youthful look.
Snoods

I can't talk of 40's hair without mentioning snoods. Apparently snoods were used way back in the Renaissance, but in the 40's they made a big comeback. Just like scarves they were a quick way to cover the hair and keeping it out of the way, but gave many opportunities to arrange intricate curls or rolls at the front.
The snood in itself was by no means boring. It was normal to decorate it further with ribbons or hair flowers. And the best part was that you could get snoods in all the colours of the rainbow!

Hair Flowers
Another popular hair accessory was flowers. At the time it became more normal for women to go without hats, and so a big flower or a whole cluster of them was a great substitute. And, as with all hair accessories of that time, the variations were endless.

Have you tried any of these hairstyles yourself?
Which one do you think you would wear if you lived back then?