For use it on femShep:
                                                  
Open (with Notepad++ or Notepad) Coalisced.ini in the directory Mass Effect 2\BioGame\Config\PC\Cooked (but at first make reserve copy of this file).

Find (hotkey Ctrl+F) 
[SFXGame.SFXPawn_Player] and write under it in section "CasualAppearances":

CasualAppearances=(Id=4002,Type=CustomizableType_Torso,Mesh=(Male="BIOG_HMF_MIR_LGT_R.LGTa.HMF_MIR_LGTa_MDL",Female="BIOG_HMF_MIR_LGT_R.LGTa.HMF_MIR_LGTa_MDL"),PlotFlag=-1)

(without spaces)

And if you want to TorsoAppearances:

TorsoAppearances=(Id=4002,Type=CustomizableType_Torso,Mesh=(Male="BIOG_HMF_MIR_LGT_R.LGTa.HMF_MIR_LGTa_MDL",Female="BIOG_HMF_MIR_LGT_R.LGTa.HMF_MIR_LGTa_MDL"),PlotFlag=-1)

And if you want also to FullBodyAppearances:

FullBodyAppearances=(Id=4002,Type=CustomizableType_Torso,Mesh=(Male="BIOG_HMF_MIR_LGT_R.LGTa.HMF_MIR_LGTa_MDL",Female="BIOG_HMF_MIR_LGT_R.LGTa.HMF_MIR_LGTa_MDL"),PlotFlag=-1)

You may also need the empty slots for shoulders, arms, legs for use this armor like chest. And create combinations with them.
Write:
ShoulderAppearances=(Id=4000,Type=CustomizableType_Shoulders,PlotFlag=-1)
ArmAppearances=(Id=4000,Type=CustomizableType_Arms,PlotFlag=-1)
LegAppearances=(Id=4000,Type=CustomizableType_Legs,PlotFlag=-1)

Then, find [Engine.PackagesToAlwaysCook]
and write under it
SeekFreePackage=BioH_END_vixen_00

Then, find [Engine.StartupPackages]
and write 
DLCStartupPackage=BioH_END_vixen_00

THEN download ME2IniFixer by Techpriest1 
http://social.bioware.com/project/2053/#files

and use it (right in directory with Coalisced.ini)

Done! 

Now you can find this armor in Shepard locker on Normandy!

P.S.

If it's still doesn't work you can try this:
Open (with Notepad++ or Notepad) BIOEngine.ini of directory Mass effect 2\BioGame\DLC\DLC_HEN_MT\CookedPC

Find [Engine.PackagesToAlwaysCook] section and delete:
!Package=CLEAR
!SeekFreePackage=CLEAR

Repeat with all BIOEngine.ini in folders of Mass effect 2\BioGame\DLC derictory.


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