In customization_slots.xtbl, try replacing this:
Code:
<Slot>
<Name>coat</Name>
<CPU_Size>28672</CPU_Size>
<Flags>
<Flag>remove on outfit</Flag>
</Flags>
<_Editor>
<Category>Entries</Category>
</_Editor>
<Render_Order>3</Render_Order>
<GPU_Size>552960</GPU_Size>
<PS3_CPU_Size>28672</PS3_CPU_Size>
<PS3_GPU_Size>491520</PS3_GPU_Size>
</Slot>
with this:
Code:
<Slot>
<Name>coat</Name>
<CPU_Size>28672</CPU_Size>
<Flags>
<Flag>remove on outfit</Flag>
</Flags>
<_Editor>
<Category>Entries</Category>
</_Editor>
<Render_Order>3</Render_Order>
<GPU_Size>552960</GPU_Size>
<PS3_CPU_Size>57344</PS3_CPU_Size>
<PS3_GPU_Size>983040</PS3_GPU_Size>
</Slot>
(Caution: Editing memory allocations works fine on PC, but I don't know about Xbox.)
The second piece of code is from GotR. Only the PS3 Sizes matter. The others don't do anything (at least, for the PC version).