Curious is one of those words whose meaning has changed since used in the KJV; therefore, it’s appropriate to study and attain a better understanding of God’s exact communication with man. Let’s start by using the modern definition of Curious (Google/ Oxford)
cu·ri·ous adjective
1. eager to know or learn something.
"I began to be curious about the whereabouts of the bride and groom"
2. strange; unusual.
"a curious sensation overwhelmed her”
But its origin is careful - I think it shares common roots with Cunning.
The KJV uses the adjective curious as artful, intricate, extremely detailed in design.
The curious girdle (Ex 28: 8, 27, 28; 29:5; 39:5, 20 ; Lev. 8:7) is not a girdle that’s eager to learn something, it’s not a detective’s garment; it’s a finely crafted, intricate, detailed garment. It was made to exacting specifications along with the other cunning works described in Exodus.
The psalmist declared, “My substance was not hid from thee, when I was made in secret, and curiously wrought …”( Psalm 139:15). We are fearfully and wonderfully made: anyone with even an elementary knowledge of biology recognizes how intricate, how detailed, our design is.
The OED has many definitions for curious, but inquisitive doesn’t show up until #5. First is Particular about details, accurate, careful, attentive, careful as to standard of excellence, clever, expert, and so on.
As time passes and we look into the New Testament, both curious and cunning will take on a negative or occultic undertone: “…cunning craftiness, whereby they lie in wait…” (Eph. 4:14) ; “Many of them also which used curious arts brought their books together, and burned them…” (Acts 19:19).
So, the next time you read of the curious girdle, or God’s creation called man, let your curiosity be satisfied (!), it’s describing a work of great detail and incredibly wonderful design.