The kirtle was a garment that supported the bust and created the correct silhouette for the period.
Farthingale measurements and setup underneath the dress. http://www.sempstress.org/2010/recreating-the-alcega-farthingale-for-modern-bodies/#
Historically Dressed - Costumes - Kirtle, Smock, Dress & Partlet, c. 1560s-70s
Late Elizabethan attire, lovingly created by Jenn
Bristol Faire 7-12-2008 - _DSC0064
Perdita at the Globe Theater. Jenny Tiramani costumer.
Tudor Corset and Farthingale by TheMostHappy, via Flickr
Elizabethan Effigy Corset Stays in Silk reed boned by redthreaded, $390.00
Elizabethan Gown-EXCERPT: Inspired by a portrait of Elizabeth Brydges 1589, the black velvet corseted gown is worn over the wheel farthingale with supporting bumroll and brocaded petticoat.