to put on
擐 centers on the action of putting on or donning something, especially clothing or armor, using the hands.
擐 combines 扌 (hand) with 睘, which likely contributes the sound and may relate to encircling or putting on. The exact historical development is uncertain.
The hand radical 扌 beside 睘 suggests using hands to put on clothing or armor. Imagine pulling a garment over your head with both hands.
For カン, picture putting on a can of armor: can -> カン, and your hands slide the metal can over your body.