Please explain what <subItems> is used for

[dydimos]

<m_FemaleOutfits>
		<m_Name>AmbulanceDriver</m_Name>
		<m_Guid>e3fcc5f7-3484-4e9f-b522-58eb17cceec9</m_Guid>
		<m_Top>false</m_Top>
		<m_Pants>false</m_Pants>
		<m_AllowPantsHue>false</m_AllowPantsHue>
		<m_AllowTopTint>false</m_AllowTopTint>
		<m_AllowTShirtDecal>false</m_AllowTShirtDecal>
		<m_items>
			<probability>0.2</probability>
			<itemGUID>6d702d88-4ca0-4bcb-9aee-d88f2be29e69</itemGUID>
			<subItems>
				<itemGUID>sfdress0-time-glas-0000-000000000000</itemGUID>
          </subItems>
        </m_items>

With this piece of code, could you explain what it is for: <subItems>? please?