SMT ACFT HAS DOOR POP OPEN ON TKOF ROLL. ABORT. STOP ON RWY TO RETRIEVE JACKET SUCKED OUT.

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WE HAD BEEN CLRED FOR TKOF ON RWY 35 IN AUS; TX. AS I APPLIED FULL PWR; THE COPLT DOOR (WHICH HAD BEEN HARD TO CLOSE IN THE PAST) SWUNG OPEN AND MY JACKET WAS SUCKED OUT. I ABORTED THE TKOF AND EXITED THE RWY; WHILE INFORMING THE TWR. I WAS; THEREFORE; CLRED TO TAXI BACK AND ALLOWED TO RETRIEVE THE JACKET. AS I APCHED THE SPOT WHERE THE GARMENT WAS; I SHUT DOWN THE R ENG AND AFTER APPLYING THE PARKING BRAKE (AND TESTING IT UNDER HIGHER PWR); I EXITED THE ACFT FOR ABOUT 15 SECONDS AND RETRIEVED THE JACKET. IN THE MEANTIME; MY PAX WAS STILL STRAPPED IN THE FURTHERMOST BACK SEAT. I RESTARTED THE R ENG AND AFTER BEING CLRED; I CONTINUED THE TKOF AND TRIP. LATER ON MY DUTY OFFICER INFORMED ME THAT MY FAILURE OF SHUTTING DOWN BOTH ENGS WAS CARELESS THAT FOR THAT REASON I WAS TERMINATED. PLEASE NOTE THAT MY COMPANY OPERATES 13 LTTS UNDER FAR 135 COMMUTER; AND I AM ATP AND TYPE-RATED ON THEM; AND THE ONE SMT IS FAR 91 FOR COMPANY TRIPS. MY REASON AS PIC TO LEAVE 1 ENG RUNNING IN THAT CIRCUMSTANCE WAS THAT I WAS GETTING ERRATIC VOLTAGE RESPONSES ON THE GAUGES AND I DID NOT WANT TO SHUT BOTH ENGS DOWN SITTING ON A RWY; TO PERHAPS FINDING OUT OF NOT BEING ABLE TO RESTART THEM DUE TO A WEAK OR DEAD BATTERY. I STILL BELIEVE MY COURSE OF ACTION WAS THE SAFEST UNDER THE CIRCUMSTANCES.