Beret (p_head_...):
mods\x64w.rpf\dlcpacks\mplts\dlc.rpf\x64\models\cdimages\mplts_p.rpf\mp_m_freemode_01_p_male_freemode_mplts
or
mods\update\x64\dlcpacks\mplts\dlc.rpf\x64\models\cdimages\mplts_p.rpf\mp_m_freemode_01_p_male_freemode_mplts

Beret Flash (p_ears_...):
mods\update\x64\dlcpacks\mpluxe2\dlc.rpf\x64\models\cdimages\mpluxe2_male_p.rpf\mp_m_freemode_01_p_mp_m_luxe_02

Beret Pin (p_eyes_...):
mods\update\x64\dlcpacks\mpchristmas2017\dlc.rpf\x64\models\cdimages\mpchristmas2017_male_p.rpf\mp_m_freemode_01_p_mp_m_christmas2017