On the graph provided in the exam, if W falls to 200 then the line P moves to the left.
In that case the feasible area is bounded by lines P and F, and the fabric line is 2W + 2L = 1,200. (The T (tailor) line becomes a redundant constraint).
(The examiners original answer was wrong – it did use the Tailor line by mistake – but it was later corrected and the Revision Kits are showing the correct answer).