This from OED
boot, n.2 Obs. Also 6_7 boote.
[App. an application of the prec., influenced by the already-existing booty; perhaps due to the phrase to make boot of, _to make profit of' (cf. boot n.1 3, quot. 1606), being taken as _to make booty of'.]
Booty; spoil; plunder.
1598 Chapman Iliad xi. 585 We foraged, as proclaimed foes, a wondrous wealthy boot_our prey was rich and great.
1618 Sylvester Job Triumph. iii. 119 Rising be_times for Boot like Free-booters.
1623 Bingham Xenophon 119 It was decreed, that_all boot taken in priuate should be deliuered vp to the vse of the generalitie.
b. esp. in phr. to make boot.
1593 Shakes. 2 Hen. VI, iv. i. 13 Thou that art his Mate, make boote of this.
1599 ---- Hen. V, i. ii. 194 Others [Bees] like Souldiers_Make boote vpon the Summers Veluet buddes: Which pillage, they_bring home.
1596 Spenser F.Q. vii. vii. 38 Harvests riches, which he made his boot.
1641 Heywood Reader, Here you'l, &c. 5 They make Boote Of every thing we wear from head to foote.
1885 Child Ballads iii. _61. 57/2 Stopping only long enough to make boot of Hjelmer's gold.