David Cameron said what matters "is not what politicians are wearing, but the ideas in the head and the actions that they are taking."
Asked whether it was "insensitive" that Theresa May had worn sparkly shoes and a Vivienne Westwood suit said to be worth £1,200 for her party conference speech, Mr Cameron said she gave "a great speech yesterday."
The Prime Minister continued: "This is a Home Secretary who has cut immigration, who has cut crime, who got Abu Qatada out of our country and back to Jordan.
"I think that's what matters most of all, not whether someone chooses to spend their money on shoes or a suit or what have you."
More top news
A transgender inmate has been found dead at Woodhill Prison in Milton Keynes.
Lexxie Harford has received hundreds of positive comments online after she decided to take social media to display her birthmark.
The opt-out system and the great generosity of families like Richard Taylor's brings great hope to those waiting for an organ transplant.