You should now see the correct Avatar for other users, including their clothes, although their still seems to be a few problems with the clothes, in that sometimes other avatar's default clothes are white.

At last, removed the need for the avatar-texture.dat file. (Please never come back).

OpenSim/Framework/General/Interfaces/IClientAPI.cs

@@ -172,6 +172,7 @@ namespace OpenSim.Framework.Interfaces
 
         void OutPacket(Packet newPack);
         void SendWearables(AvatarWearable[] wearables);
+        void SendAppearance(LLUUID agentID, byte[] visualParams, byte[] textureEntry);
         void SendStartPingCheck(byte seq);
         void SendKillObject(ulong regionHandle, uint avatarLocalID);
         void SendAnimation(LLUUID animID, int seq, LLUUID sourceAgentId);