Maybe it will be useful to add a comment here.
For LUKS partition, it is said to delete and re-create the partition at the same place, but larger before calling cryptsetup resize.
But when you created your partition long time ago, it start at the sector 63. Using fdisk, the partition will be recreated at the wrong offset, resulting in a lost partition.
I've managed to recover it using fdisk -c=dos to be able to create partition from sector 63, without troubles.