Take your usual size or size up for a slouchier look
Rough guide (please use actual measurements below for accuracy: XS8 S10 M12 L14 XL16
Rae is wearing size small in the photos and is a 10-12.
Measured laid flat in CM's
Chest - XS44.5 S47 M49.5 L52 XL54.5
Body Length - XS64 S65 M66 L67 XL68