Repro rate is not 100%.
Modlist: https://rentry.co/hndqqgha
Logs: https://gist.github.com/HugsLibRecordKeeper/2453a6efd0f2fdef42931bcf841a1fcf

Before caravan were spawned I get spam of warnings + some errors, TPS and FPS went down really low, from ~1000TPS with already 2 caravans on map I went down to 50TPS while third caravan were spawned and for a few minutes after spawn.
From what I understand here, pawns are trying to wear animal clothing:

Min tried to wear Apparel_SmallAnimalScarf123698 but he has no body parts required to wear it.
UnityEngine.StackTraceUtility:ExtractStackTrace ()
Verse.Log:Warning (string)
(wrapper dynamic-method) RimWorld.Pawn_ApparelTracker:RimWorld.Pawn_ApparelTracker.Wear_Patch8 (RimWorld.Pawn_ApparelTracker,RimWorld.Apparel,bool,bool)
DressForTheWeather.IncidentWorker_PawnsArrivePatch:DressPawnAppropriately (Verse.Pawn,Verse.Map)
(wrapper dynamic-method) DressForTheWeather.IncidentWorker_PawnsArrivePatch:DressForTheWeather.IncidentWorker_PawnsArrivePatch.Postfix_Patch0 (System.Collections.Generic.List`1<Verse.Pawn>&,RimWorld.IncidentParms)
(wrapper dynamic-method) RimWorld.IncidentWorker_NeutralGroup:RimWorld.IncidentWorker_NeutralGroup.SpawnPawns_Patch3 (RimWorld.IncidentWorker_NeutralGroup,RimWorld.IncidentParms)
GiddyUpCaravan.Harmony.Patch_IncidentWorkers:MountAnimals (RimWorld.IncidentWorker_TraderCaravanArrival,RimWorld.IncidentParms)
(wrapper dynamic-method) RimWorld.IncidentWorker_TraderCaravanArrival:RimWorld.IncidentWorker_TraderCaravanArrival.TryExecuteWorker_Patch0 (RimWorld.IncidentWorker_TraderCaravanArrival,RimWorld.IncidentParms)
(wrapper dynamic-method) RimWorld.IncidentWorker:RimWorld.IncidentWorker.TryExecute_Patch2 (RimWorld.IncidentWorker,RimWorld.IncidentParms)
(wrapper dynamic-method) RimWorld.Storyteller:RimWorld.Storyteller.TryFire_Patch1 (RimWorld.Storyteller,RimWorld.FiringIncident)
RimWorld.IncidentQueue:IncidentQueueTick ()
RimWorld.Storyteller:StorytellerTick ()
(wrapper dynamic-method) Verse.TickManager:Verse.TickManager.DoSingleTick_Patch7 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
(wrapper dynamic-method) Verse.Game:Verse.Game.UpdatePlay_Patch4 (Verse.Game)
(wrapper dynamic-method) Verse.Root_Play:Verse.Root_Play.Update_Patch3 (Verse.Root_Play)

And errors:

System.NullReferenceException: Object reference not set to an instance of an object
at (wrapper dynamic-method) VFECore.Pawn_ApparelTracker_Wear_Patch.VFECore.Pawn_ApparelTracker_Wear_Patch.Postfix_Patch0(RimWorld.Pawn_ApparelTracker,RimWorld.Apparel,bool,bool)
at (wrapper dynamic-method) RimWorld.Pawn_ApparelTracker.RimWorld.Pawn_ApparelTracker.Wear_Patch8(RimWorld.Pawn_ApparelTracker,RimWorld.Apparel,bool,bool)
at DressForTheWeather.IncidentWorker_PawnsArrivePatch.DressPawnAppropriately (Verse.Pawn pawn, Verse.Map map) [0x0035e] in <3c9bdbd106d14e27ba19de8523ee8b52>:0
at (wrapper dynamic-method) DressForTheWeather.IncidentWorker_PawnsArrivePatch.DressForTheWeather.IncidentWorker_PawnsArrivePatch.Postfix_Patch0(System.Collections.Generic.List`1<Verse.Pawn>&,RimWorld.IncidentParms)
at (wrapper dynamic-method) RimWorld.IncidentWorker_NeutralGroup.RimWorld.IncidentWorker_NeutralGroup.SpawnPawns_Patch3(RimWorld.IncidentWorker_NeutralGroup,RimWorld.IncidentParms)
at GiddyUpCaravan.Harmony.Patch_IncidentWorkers.MountAnimals (RimWorld.IncidentWorker_TraderCaravanArrival instance, RimWorld.IncidentParms parms) [0x00000] in <2c06e926398e44819faafd8e89da05b0>:0
at (wrapper dynamic-method) RimWorld.IncidentWorker_TraderCaravanArrival.RimWorld.IncidentWorker_TraderCaravanArrival.TryExecuteWorker_Patch0(RimWorld.IncidentWorker_TraderCaravanArrival,RimWorld.IncidentParms)
at (wrapper dynamic-method) RimWorld.IncidentWorker.RimWorld.IncidentWorker.TryExecute_Patch2(RimWorld.IncidentWorker,RimWorld.IncidentParms)
at (wrapper dynamic-method) RimWorld.Storyteller.RimWorld.Storyteller.TryFire_Patch1(RimWorld.Storyteller,RimWorld.FiringIncident)
at RimWorld.IncidentQueue.IncidentQueueTick () [0x00048] in <cd7169108ea74757aa50c5b33d275c15>:0
at RimWorld.Storyteller.StorytellerTick () [0x00000] in <cd7169108ea74757aa50c5b33d275c15>:0
at (wrapper dynamic-method) Verse.TickManager.Verse.TickManager.DoSingleTick_Patch7(Verse.TickManager)
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch3 (string)
(wrapper dynamic-method) Verse.TickManager:Verse.TickManager.DoSingleTick_Patch7 (Verse.TickManager)
Verse.TickManager:TickManagerUpdate ()
(wrapper dynamic-method) Verse.Game:Verse.Game.UpdatePlay_Patch4 (Verse.Game)
(wrapper dynamic-method) Verse.Root_Play:Verse.Root_Play.Update_Patch3 (Verse.Root_Play)