help on with

help (someone) on with (something)

To assist someone in putting on a clothing item. Help Grandma on with her coat, will you? I'll help the kids on with their bathing suits while you get their towels.
See also: help, on

help someone on with something

to help someone put on an article of clothing. Would you help me on with my coat? Please help her on with her coat.
See also: help, on