English:Rabbi Shimon ben Gamliel said: Did he not have other garments? Rather, these were the desirable garments that he wore because he served in the role of the Kohen Gadol.
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.