Credits to GReinoso96

Armor Models and Textures can be found in nativeNX\arc\player\com\m for male armor and nativeNX\arc\player\com\f female armor , with each armor having its own folder with a different arc file for each piece. Kiranico MHXX and MHGU can be used to identify the number of each armor by inspecting the page's elements and clicking on the armor's model in the page, much like the weapons.

Armor base stats can be found in a folder called table inside resident.arc inside NativeNX\loc\arc for MHGU, and NativeNX\arc for MHXX Switch ver. The file is called armorSeriesData.7896B60A

Armor base data file have an 8 byte header. The first 4 bytes are 00 00 18 42, and the remaining 4 are an in32 count. If you must add new armor, increase the count after doing so.

Offset	Length	Description
+0	int32	ID/counter
+4	int16	Second ID/Counter, possibly sort ID?
+6	byte	Unknown. Possibly Helm existence flag
+7	byte	Unknown. Possibly Chest existence flag
+8	byte	Unknown. Possibly Arms existence flag
+9	byte	Unknown. Possibly Waist existence flag
+10	byte	Unknown. Possibly Legs existence flag
+11	int16	Model ID
+13	byte	Unknown. Probably male equipable flag
+14	byte	Unknown. Probably female equipable flag
+15	byte	Blade Master equipable flag
+16	byte	Gunner equipable flag
+17	int32	Cost
+21	int16	Unknown, always zero. Cost might be int48? overkill much, capcom?
+23	byte	Fire res per piece
+24	byte	Water res per piece
+25	byte	Thunder res per piece
+26	byte	Ice res per piece
+27	byte	Dragon res per piece
+28	int16	Helm skill 1 ID
+30	byte	Helm skill 1 points
+31	int16	Helm skill 2 ID
+33	byte	Helm skill 2 points
+34	int16	Helm skill 3 ID
+36	byte	Helm skill 3 points
+37	int16	Helm skill 4 ID
+39	byte	Helm skill 4 points
+40	int16	Helm skill 5 ID
+42	byte	Helm skill 5 points
+43	int16	Chest skill 1 ID
+45	byte	Chest skill 1 points
+46	int16	Chest skill 2 ID
+48	byte	Chest skill 2 points
+49	int16	Chest skill 3 ID
+50	byte	Chest skill 3 points
+51	int16	Chest skill 4 ID
+53	byte	Chest skill 4 points
+55	int16	Chest skill 5 ID
+57	byte	Chest skill 5 points
+58	int16	Arms skill 1 ID
+60	byte	Arms skill 1 points
+61	int16	Arms skill 2 ID
+63	byte	Arms skill 2 points
+64	int16	Arms skill 3 ID
+66	byte	Arms skill 3 points
+67	int16	Arms skill 4 ID
+69	byte	Arms skill 4 points
+70	int16	Arms skill 5 ID
+72	byte	Arms skill 5 points
+73	int16	Waist skill 1 ID
+75	byte	Waist skill 1 points
+76	int16	Waist skill 2 ID
+78	byte	Waist skill 2 points
+79	int16	Waist skill 3 ID
+81	byte	Waist skill 3 points
+82	int16	Waist skill 4 ID
+84	byte	Waist skill 4 points
+85	int16	Waist skill 5 ID
+87	byte	Waist skill 5 points
+88	int16	Legs skill 1 ID
+90	byte	Legs skill 1 points
+91	int16	Legs skill 2 ID
+93	byte	Legs skill 2 points
+94	int16	Legs skill 3 ID
+96	byte	Legs skill 3 points
+97	int16	Legs skill 4 ID
+99	byte	Legs skill 4 points
+100	int16	Legs skill 5 ID
+102	byte	Legs skill 5 points
+103	byte	Rarity
+104	int16	number of upgrades
+106	byte	Base defense per piece
+107	byte	Unknown
+108	byte	Helm slot count
+109	byte	Chest slot count
+110	byte	Arms slot count
+111	byte	Waist slot count
+112	byte	Legs slot count
+113	byte	Unknown
+114	byte	Unknown
+115	byte	Unknown
+116	byte	Unknown
+117	byte	Unknown
+118	byte	Unknown
+119	byte	Unknown
+120	byte	Unknown
+121	byte	Unknown
+122	byte	Unknown
+123	byte	Unknown
+124	byte	Unknown
+125	byte	Unknown
+126	byte	Unknown