Word to the wise, buying at event is expensive (Although Chows makes good stuff, the prices usually go up to £300~ for a full kit set) but I’d say getting basic costume at event would cost around £80-100~, so have a hunt round charity shops!
Also, Armour cost really does vary, but I’ll run the average here.
Poly Plate, Bracers and Greaves- £150~ if you get a good deal, but more than likely £200~ range.
Leather Cuirass, Bracers and Greaves- £250~ because leather is expensive, Darkblade tends to be the best for this, but Umbra make really amazing commissions!
Gambeson, Bracers and Greaves- £80-£100~, and this can function as soft kit in cold weather
Chainmail- £80-£200- The higher the price, higher the quality, but due to armour changes, the materials don’t really matter. You can also get sets off E-Bay for £20~, but they don’t last more than 2 events, and have no resale value
(I would also recommend buying a gambeson for any set, as it helps with chafing, but will put you up armour size)
This, plus weapon costs being around £120-£150 for Sword and Shield, or a spear (Epic Armouries and Saxon Violence for stab safe) means that its gonna be expensive, so consider cutting down on Soft Kit costs in any way you can
And Mage Armour can go for £5 when homemade, or £50 for a nice set from Darkblade.
Don’t let this discourage you though, many veterans will be happy to loan you stuff to make sure you come back through the gate.