The publisher is also planning further brand extensions.IPC holds the licence to publish the magazine in the UK from Hachette Filipacchi.
The French publisher, which has a large stake in Marie Claire, is understood to be reviewing the title's UK publishing arrangements next summer.
The consumer magazine ABCs for January to June, published this week, will show that Marie Claire has underperformed in the fashion market for the first time since it was relaunched in autumn 2004.
The title was relaunched with a smaller size, a lower cover price and a second travel-sized edition.
The title's news-stand copy sales are expected to fall faster than the overall fashion market's drop of about 10%.
Richard Johnstone, publishing director at Marie Claire, said it had particularly underperformed in supermarkets, where about 30% of fashion magazines are sold.
He said the growing appeal of weekly magazines - such as weeklies Heat and Grazia - to Marie Claire's target audience had also demanded a re-assertion of the strengths of a monthly magazine for women in their thirties.
"We found that readers were concerned that we were broadening the editorial too much and had become too young-looking," he said. "We've been guilty of slightly diluting the magazine."
He said any changes to editorial would focus on improving Marie Claire's key areas of reportage, celebrity, fashion, beauty and advice.
The changes follow controversy at the after siding with readers who complained about an interview with pop star and actress Ashlee Simpson.
IPC is appointing an editor for its recently-launched website and will launch a mobile platform in the autumn.
It is also looking for a commercial partner for the first Marie Claire-branded fashion event next year. Rivals Glamour, Elle and Cosmopolitan all host events.
The new-look Marie Claire is on sale 5 October.
IPC holds the licence to publish the magazine in the UK from Hachette Filipacchi.
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