Is it good for a girl to receive a boy's hairpin

Not good. Because the hairpin as a personal item has a special meaning, if casually given will cause misunderstanding, is also offensive. In the past, when young men and women in rural areas were engaged, the man would give the woman a hairpin, and after the woman accepted the hairpin, it proved that the two were established as husband and wife, and the girl would recognize and follow the boy. There are no special circumstances, will not change the relationship between the two couples, now the rural young men and women engaged to seem to not send hairpins this thing.