Following your advice I tried to modify the suit and helmet as in the pilot screen attached. I noticed that if a mission where, in addition to my custom pilot suit with P51D, P51D are others, in the latter not seen the suit by default. I solved the problem by editing descriptor.lua other aircraft forcing the suit by default.
My file .lua:
{"pilot_P51_patch", 0 ,"pilot_P51_patch_Mario",false};
{"pilot_P51_body", 0 ,"pilot_P51_01_VBS",false};
{"pilot_P51_helmet_A", 0 ,"pilot_p51_helmet_VBS3",false};
Other files .lua:
{"pilot_P51_patch", 0 ,"empty",true};
{"pilot_P51_body", 0 ,"pilot_P51",true};
{"pilot_P51_helmet_A", 0 ,"pilot_P51_helmet_a",true};
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