haustement
A close-fitting undergarment, over which the armor (and hose) were fastened.
historical, obsolete
The Haustement or Ajustement, […] was made to the shape and worn with the shirt […] The doublet and haustement of this period supplied the place of the wambais and hoqueton formerly worn . 2. The doublet must be streightly bounde . The first part of the dress being thus put on , it is to be closely bound round the ...
Where it comes from
From Middle English haustement, perhaps from Old French ajostement.
Adapted from the Wiktionary entry haustement (CC BY-SA 4.0).