What's the difference between drapery and undrape?

Drapery

Definition:

(n.) The occupation of a draper; cloth-making, or dealing in cloth.
(n.) Cloth, or woolen stuffs in general.
(n.) A textile fabric used for decorative purposes, especially when hung loosely and in folds carefully disturbed; as: (a) Garments or vestments of this character worn upon the body, or shown in the representations of the human figure in art. (b) Hangings of a room or hall, or about a bed.

Example Sentences:

(1) Consumer products such as cosmetics, cigarettes, textiles, furniture, draperies, and preservatives release formaldehyde.
(2) The department store began as a small drapery store in Glasgow.
(3) If Edward I's pendulous swags – the replica drapery that forms part of the lavishly recreated Plantagenet bedchamber currently on display in the Tower Of London – were any more pendulous, their combined weight would probably bring down the ceiling, Beefeaters and all.
(4) They are in stately homes of the mind - under lofty pillars, among fine draperies, with a view over rolling parkland.
(5) methods revealed the nmj on the extensor digitorum muscle to be covered by a delicate drapery of postjunctional folds that surround the immature endplate region.
(6) The retailer, which traces its roots back to a small Glasgow drapery shop opened by Hugh Fraser and James Arthur in 1849, had been pushing ahead with flotation plans after sale talks with France's Galeries Lafayette and Sports Direct founder Mike Ashley collapsed in January.

Definition:

Example Sentences:

(1) This includes early surgery, using a special reduction device, a marker to help interpretation of fracture alignment, limiting the surgical field to the trochanteric area with the thigh undraped to facilitate mobilization of the undraped C-arm, avoiding unnecessary intermediate reamers, less cortical reaming and a second team for distal locking when required.