Concept:
Episiotomy repair is done layer by layer. The usual order is vaginal mucosa first, then perineal muscles, and finally the skin.
Step 1: Start from the deepest visible internal layer.
The repair begins with the vaginal mucosa because it is the inner lining that must be closed first.
Step 2: Repair the muscular layer.
After mucosal closure, the perineal muscles are approximated to restore support and strength.
Step 3: Close the skin last.
Finally, the skin is closed to complete the repair.
Thus, the sequence is:
\[
\text{Mucosa} \rightarrow \text{Muscle} \rightarrow \text{Skin}
\]
Therefore, the correct answer is Mucosa $\rightarrow$ Muscle $\rightarrow$ Skin.