For those of you who are looking for the IDs of particular items
Here's the complete list(
warning - it's quite long):
3| Doom Knight Armor
4| Viking Armor
5| Privateer Clothes
6| Necromancer Robes
7| Mage Robes
8| Good Knight Armor
9| Battle King Armor
10| Black Knight Armor
11| Viking Blade
12| DoomKnight Sword
13| Necromancer's Wand
14| Mage Wand
15| Battle King Lance
16| Viking Helm
17| Privateer Hair
19| Doom Knight Helm
20| Battle King Helm
21| Black Knight Helm
22| DoomKnight Cape
23| Twilly
24| Rogue Leather Armor
25| Knightly Sword
26| Dagger
27| Wizards Scepter
28| Mage Staff
29| Battleaxe
30| Anubis Armor
31| Blade Master Outfit
32| Fire Elemental Form
33| Water Elemental Form
34| Wind Elemental Form
35| Ninja Outfit
36| Paladin Armor
37| Pirate Outfit
38| Samurai Armor
39| Sea Warrior Armor
40| Shaman Robes
41| Undead Warrior Armor
42| Fire Elemental Head
43| Water Elemental Head
44| Wind Elemental Head
45| Lemurdin Helm
46| Warlic's Hair
47| Necromancer Hood
48| Ninja Mask
49| Paladin Helm
50| Pirate Hat
51| Privateer Lady's Hair
52| Samurai Helm
53| Sea Warrior Helm
54| Shaman Mask
56| Warrior Helm
57| Warrior Armor
58| Anubis Wraps
59| DragonSlayer Cloak
60| Blade Master Wraps
61| Battle King Robe
62| Elemental Flame Cloak
63| Elemental Water Wrap
64| Elemental Wind Cape
65| Good Knight Back Sheath
66| Lemurdin Tail Cloak
67| Dark Blue Cloak
68| Necromancer Wrap
69| Ninja Back Star
70| Paladin Cloak
71| Red Cape
72| Stealthy Cape
73| Samurai Back Sheath
74| Cape Of The Deep
75| Shaman Back Furs
76| Viking Back Hammer
77| Warrior Back Shield
78| Spear Of The Sands
79| Bladed Reaver
80| Black Knight Blade
81| Master Blade
82| Blade Of Ruin
83| Broom
84| Cinderblade
85| Cobra Staff
86| Elemental Flame
87| Elemental Wave
88| Elemental Gust
89| Energy Dagger
90| Goldthorn Scepter
91| Heaven's Door
92| Brutal Horc Dagger
93| Frost Cutter
94| Ninja Shuriken
95| Paladins Hope
96| Pirate Cutlass
97| Prime Blade of Awe
98| Privateer Saber
99| Rogue Shortsword
100| Ruby Edge
101| Samurai Katana
102| Sea Warrior Trident
103| Shadow Strike
104| Shaman Staff
105| Grim Skullsword
106| iSWORD 5
107| SmartSWORD Pink
108| Split Ravager
109| Blue Starsword
110| Red Starsword
111| Green Starsword
112| Runed Dark Sword
113| Winged Slasher
114| Yara's Sword
116| Fangs
117| Lil' Peepers
118| Blizzy
119| Lepus
120| Needles
121| Crushed Kandy
122| Nevermore
123| Cthulhu
124| Rose
125| Buttercup
126| D20
127| Daimyo
128| Battlepuppy Daimyo
129| Reaper
130| Fido
131| Frosty
132| Bulba
133| Sparky
134| Inferno
135| Rocky Jr.
136| Tidalwave
137| Twister
138| Chaos Eye
139| Tinkle
140| Yip
141| Haunt
142| Glub
143| Jackalope
144| Jacky O.
145| Kabroz
146| Claws
147| Grumpy Kitty
148| Mochi
149| NaN Pony
150| Onigiri
151| Wighead
152| Pong
153| Cash
154| Flappy Bird
155| Wyrmtail
156| Geo
159| Chuckles
160| Guffaws
161| Slender
162| Google
163| Sneevil
164| Lefty
165| Spirit Orb
166| Nimbus
167| Prof. Oak
168| Cali Roll
169| Bengal
170| Rubber
171| Wipeout
172| Sharptooth
173| Cybertooth
174| Trobble
175| Van Gogh
176| Twig
177| Uni
178| Fail Whale
179| Howl
180| Ghost
181| Zorbak
182| Spectre Sheets
183| Spectral Back Shield
184| Spectral Shard
185| Spectral Hood
186| Monk Robes
187| Monk Staff
188| Monk Focus Points
189| Monk Tattoos
190| Monk Cloak
191| Clockwork Head
193| Silent Stone
194| Silent Slime
197| Silent Sanguine
198| Slime Skin
199| Hemogoblin Skin
200| Slime Skull
201| Hemogoblin Skull
202| Slime Cape
203| Hemogoblin Shroud
205| Skeleton Mask
207| Undead Ninja Hood
211| Rogue Hood
212| Undead Zombie Head
213| Gladiator Armor
214| Gladiator Spear
215| Gladiator Helm
216| Gladiator Cloak
218| Scarecrow Rags
220| DragonSlayer Armor
221| Creepy Jester Outfit
224| Mad Scientist Outfit
225| Tanuki Warrior Armor
228| Tanuki Skin
229| Black Knight Cloak
230| Tanuki Head
231| Tanuki Headwrap
232| Tanuki Warrior Coolie
233| Mad Scientist Goggles
234| MOSNTER Witch Face
235| Creepy Jester Hat
236| Scarecrow Pumpkin Head
237| DragonSlayer Helm
238| Tanuki Naginata
239| Creepy Jester Scepter
240| Dragonblade
241| Scarecrow's Crookstaff
242| Creepy Jester Wraps
244| Wolfman Skin
245| Wolfman Bone Club
246| Wolfman Tail
247| Wolfman Face
248| Sneevil Warrior Armor
249| Deeplord Armor
250| Red Pirate
251| Fire Mage Robes
252| Stinger Ninja Outfit
253| Avenger's Armor
254| Celtic Condemner Armor
255| Assassin Outfit
256| Frost Herald Armor
257| Sneevil Warrior Cape
258| Deeplord Dorsal Fins
259| Celtic Condemner Cloak
260| Assassin Cloak
261| Sneevil Face
262| Sneevil Open Helm
263| Sneevil Full Helm
264| Deeplord Helm
265| Deeplord Head
266| Red Pirate Hat
267| Stinger Ninja Mask
268| Avenger Helm
269| Celtic Condemner Helm
270| Assassin Cowl
271| Frost Herald Helm
272| Sneevil Box Cutter
273| Deeplord's Trident
274| Celtic Condemner Lance
275| Assassin Shortsword
276| Frost Herald Sword
277| Vampire Clothes
278| Vampire Life Drinker
279| Vampire Cloak
280| Vampire Hair
282| Pyromancer Robes
283| Pyromancer Cloak
284| Pyromancer's Flaming Skull
285| Dinobone Armor
286| Dinohide Cloak
287| Dinobone Helm
288| Dinobone Battleaxe
289| Good Knight Blade
300| BalROCK Form
301| BalROCK Mace
302| BalROCK Head
303| BalROCK Flame Cloak
305| Anubis Mask
306| Frost Herald Furs
316| Cysero's Hammer
317| Cysero's Glowing Hammer
318| DragonKnight Armor
319| DragonKnight Helm
320| DragonKnight Blade
321| DragonKnight Wings
322| Rusty Sword
323| Rusty Dagger
324| Cracked Staff
And here's the link to the unedited file containing all the IDs:
Also, if you'd like to change all types of items at once(incl. the pet), then you can achieve that with Charles. Here's a step-by-step guide on how to do it:
Step 1. Open up both the game and Charles(I'm assuming you already have installed it).
No need for a picture to demonstrate this step.
Step 2. Hover over the 'Proxy' tab and enable Windows Proxy(and/or Mozilla Proxy) in case it is disabled and make sure that recording is enabled too.
Step 3. Go to the shop in the game and click on any item you have bought that is not currently equipped.
Step 4. Clear the session(by clicking on the trash icon) in order to get rid of unnecessary connections.
Step 5. Go back to the game window and equip the item.
Step 6. Look for 'battlegemssvc.aspx', once you've found it right-click on it and choose 'Edit'.
Step 7. Navigate to the 'Form' tab and there you should see all the data about your character, just double-click anywhere on it and edit out all the IDs of your character's equipment to whatever you want.
Step 8. Once you're done editing the IDs click the 'Execute' button.
Step 9. Refresh the game to see if you did everything right, if not repeat all the steps once again.
The set that I have on the last picture is the Battle King set and the pet is the Reaper(ID: 129)
Good luck!