9 1 0 s . ▁Men ▁also ▁began ▁to ▁wear ▁less ▁formal ▁daily ▁att ire ▁and ▁athlet ic ▁cl othing ▁or ▁' S ports we ar ' ▁became ▁a ▁part ▁of ▁main stream ▁fashion ▁for ▁the ▁first ▁time . ▁The ▁ 1 9 2 0 s ▁are ▁character ized ▁by ▁two ▁distinct ▁periods ▁of ▁fashion : ▁in ▁the ▁early ▁part ▁of ▁the ▁de cade , ▁change ▁was ▁slower , ▁and ▁there ▁was ▁more ▁rel uct ance ▁to ▁wear ▁the ▁new , ▁reve aling ▁popular ▁styles . ▁From ▁ 1 9 2 5 , ▁the ▁public ▁more ▁passion ately ▁emb rac ed ▁the ▁styles ▁now ▁typically ▁associated ▁with ▁the ▁Ro aring ▁Tw ent ies . ▁These ▁styles ▁continued ▁to ▁character ize ▁fashion ▁until ▁the ▁world wide ▁de pression ▁w ors ened ▁in ▁ 1 9 3 1 . ▁ ▁Over view ▁ ▁After ▁World ▁War ▁I , ▁the ▁United ▁States ▁entered ▁a ▁prosper ous ▁era ▁and , ▁as ▁a ▁result ▁of ▁its ▁role ▁in ▁the ▁war , ▁came ▁out ▁onto ▁the ▁world ▁stage . ▁Social ▁custom s ▁and ▁mor als ▁were ▁relax ed ▁in ▁the ▁optim ism ▁brought ▁on ▁by ▁the ▁end ▁of ▁the ▁war ▁and ▁the ▁bo oming ▁of ▁the ▁stock ▁market . ▁Women ▁were ▁entering ▁the ▁work force ▁in ▁record ▁numbers . ▁In ▁the ▁United ▁States , ▁there ▁was ▁the ▁en act ment ▁of ▁the ▁ 1 8 th ▁Am end ment , ▁or ▁as ▁many ▁know ▁it , ▁Pro hib ition , in ▁ 1 9 2 0 . ▁Pro hib