How to obtain sets

[Siniroth]

General Rule of thumb ive noticed. if ur looking for, say, the 48 set necklace, then ur range of monster levels is(in theory) 48-59. at 60, the next set should start dropping. now some Bosses are more inclined to drop set items more than others, i almost always get a set item fromt he Black Scorpion.

But yea, TL;DR: Kill between the set u want, and the next set in Level Requirements. 48-59, 60-71, 72-83, etc