▁World ▁War ▁II ▁British ▁Army ' s ▁Battle ▁D ress ▁jack et ▁introduced ▁by ▁General ▁D w ight ▁Eisen h ower ▁ ▁Field ▁jack et , ▁a ▁jack et ▁that ▁is ▁worn ▁by ▁soldiers ▁on ▁the ▁battle field ▁or ▁doing ▁duties ▁in ▁[[ c old ▁weather > ]. ▁The ▁field ▁jack et ▁came ▁about ▁during ▁World ▁War ▁II ▁with ▁the ▁US ▁Army ▁introdu cing ▁the ▁M - 1 9 4 1 ▁and ▁the ▁M - 1 9 4 3 ▁field ▁jack et ▁and ▁issued ▁the ▁jack et ▁to ▁their ▁troops . ▁The ▁most ▁well - known ▁and ▁the ▁most ▁popular ▁type ▁of ▁military ▁field ▁jack et ▁that ▁is ▁on ▁the ▁market ▁today ▁is ▁the ▁M - 1 9 6 5 ▁or ▁M - 6 5 ▁field ▁jack et ▁which ▁came ▁into ▁US ▁military ▁service ▁in ▁ 1 9 6 5 . ▁ ▁F lak ▁jack et ▁ ▁Fle e ce ▁jack et , ▁a ▁cas ual ▁jack et ▁made ▁of ▁synth etic ▁w ool ▁such ▁as ▁Pol ar ▁Fle e ce ▁ ▁Fl ight ▁jack et , ▁also ▁known ▁as ▁a ▁bom ber ▁jack et ▁ ▁G ile t , ▁a ▁sle e vel ess ▁jack et ▁or ▁vest . ▁▁ ▁H ack ing ▁jack et ▁ ▁Harr ington ▁jack et , ▁a ▁light weight ▁wa ist - length ▁jack et ▁ ▁H ood ie , ▁a ▁z i pper ed ▁h ood ed ▁swe at sh irt ▁( non ▁z i pper ed ▁can ▁be ▁considered ▁a ▁swe at sh irt ▁only