As we are taking a look at undies this week, we bring you a special long distance 7 Day Challenge duet featuring Katie and Kelli Smith. We feel that the Bridget Jones films have given big pants a bad reputation and we wanted to fix that. So each day our presenters will be reviewing big knickers. For Day 6 we also have Kelli Smith reviewing the Knickerbox Planet Smooth Talker recycled stripe mesh high waist Brazilian knickers. Come back tomorrow for Kelli's final day of her week long challenge. Will her favourite from the week match what Katie chooses? Find out tomorrow.

"I like these and it says they are sustainable and using 100% recycled fabrics." Kelli Smith