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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.