Hi mate.
Well, if you're thinking about setting a new standard for your fellow Orc-larpers in down-under, you've come to the right place.
The link Urok gave you will give you a shitton of information about different approaches to costume building, plus lots of pictures for inspiration.
Experience has shown, that the best way to start is with the lowest layer of your costume.
A well made and good looking tunic and a robust set of pants will set the standard for the rest of the costume, plus the potential armor you'll put on top at the later stages.
When you're finished with the basics and you're happy with it, work your way through arm and leg protection. Bracers and Shinguards are always useful, especially in Australia where pretty damn everything is
venomous a good crafty shinguard and propper boots seem like a good idea
.
People tend to get bonkers with the armour and turtle up to a point, where moving becomes exhausting. Remember, that you'll have to fight in the stuff.
When you start building, think practical. Orcs are not a race known for their intricate designes or beautiful craftsmanship when it comes to clothing. Shit has to be practical. It has to protect you, it has to keep you warm without boiling you and (this is personal advice:) you'll have to get out of it in an acceptable amount of time. You will thank me for these words, whenever you're in costume and you get the shits. Getting rid of three layers of clothing, a chainmal, platearmour on top plus the usual collection of belts, pouches n stuff will feel like an eternity when you really need to drop the kids at the pool. So...
plan ahead. It makes your life much easier and saves you a lot of work.
Hope it helps a bit.
Greetz Zhûul