The 32-year-old opera star is offering one lucky fan the chance to own the bright orange outfit she wore in the finale, reported Daily Star.
The dress is listed on an online shopping portal and all proceeds from the sale will go towards a 500,000 pounds restoration project for St David's Church in the small town of Neath in Wales.
Jenkins had also staged an intimate acoustic gig at the church last week to boost fundraising for the scheme.