Adam and Eve "knew" they where naked...the word means to discern Jerami, to KNOW...they learned it Jerami....learned it.
Don't you read Hebrew?
Gen 3:7 And the eyes of them both were opened, and they knew that they were naked; and they sewed fig leaves together, and made themselves aprons.
י ד ע
yä·dah'
1) to know
a) (Qal)
1) to know
a) to know, learn to know
b) to perceive
c) to perceive and see, find out and discern
d) to discriminate, distinguish
e) to know by experience
f) to recognise, admit, acknowledge, confess
g) to consider
2) to know, be acquainted with
3) to know (a person carnally)
4) to know how, be skilful in
5) to have knowledge, be wise
b) (Niphal)
1) to be made known, be or become known, be revealed
2) to make oneself known
3) to be perceived
4) to be instructed
c) (Piel) to cause to know
d) (Poal) to cause to know
e) (Pual)
1) to be known
2) known, one known, acquaintance (participle)
f) (Hiphil) to make known, declare
g) (Hophal) to be made known
h) (Hithpael) to make oneself known, reveal oneself