Right. Well, good news for you 
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I play Dawn and can talk about from experience
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Knight Errant is an excellent (and cheap) place to start.
To count as a suit of heavy you need to cover the torso and at least one other location. So for heavy, what often appears is torso + greaves (1/2 legs) + bracers (1/2 arms). For example, something like this:
combined with some extra parts like the shin guards and arm guards at the bottom of this pageā¦
https://www.gdfb.co.uk/larp-steel-armour-232-c.asp
That would get you brand-new shining armour for under £150. Good coverage, and would count as heavy. Shopping around, you can probably find similar cheaper.
I would reccomend, though, that you wait for the event, arrive early (Thursday, early Friday), and buy on site. There will likely be some chainmaille, or indeed plate, at a cheaper price than online⦠possibly second-hand. The bonus of buying on-site is that you can try it on before you by,. The downside, of course, is that you might not find anything you like.
Alternitively, I suggest you ask your fellow players, and especially those of Dawnā¦
ā¦who may well have spare armour, outgrown armour, etc, which they may be willing to sell or even lend at the event.
I reccomend against investing in a helmet. Because they tend to be expensive and cumbersome, and head hits are strongly discouraged in the system anyway.
For the rest of kit, you may well need a gambeson (padding under armour). Depending on the armour, a heavy flannel shirt/rugby shirt could do the job here.
Shirt, neutral trousers, belt, possibly a belt pouch⦠reasonably cheap to acquire and all purchasable on site.
Knight Errant kit calls for the Dawnish tabard; Golden sun on royal blue. This can be as complex or simple as you like. Simplest version is a long rectangle of cloth, with a hole cut for your head, and the sun done in fabric paint across the chest.
Again, some or all of the above is likely available by asking politely from other players.
Knight Errant, in addition to having a minimal kit (you donāt even need the armour, to be honest. Itās uncommon, but many a knight has attained nobility without taking the field of battle. And thatās not even counting the magesā¦), is an excellent starting character type. Because you have an in-game reason to be an ambitious stranger, chatting to everyone, asking stupid questions, and wanting to have lots explained to you.
ā¦I could go on for a whileā¦
I am happy to discuss kit, weapons, Dawnish Houses, playing a Knight Errant, or whatever else. Be warned, I may try to recruit you to the House Iām in⦠