English: What is meant by “the desirable [clothes]”? That he used to minister in them in the [role of] High Priesthood.
On the daf / in context: Before the appointment of the kohanim, the firstborn performed the sacrificial service; Esav’s special garments were those of the firstborn’s priestly role.
Type of Learning
Custom (aggadah — firstborn’s priestly garments)
What Is Learned
The “desirable clothes” of Esav were the garments of the firstborn’s priestly service; Rivkah dressed Yaakov in them for the blessing.