Thanks for your inquiry! The Parfait by Affinitas: Florence Balconette Convertible Lace Bra features adjustable straps designed to stretch, so you should certainly be able to convert this bra to a halter style. I've added some additional styles below that may also meet your needs. The b.tempt'd by Wacoal b.wow'd Push-Up Bra, Felina Bra of the Year Strapless, and Va Bien Ultra-Lift Plunge Convertible Bra can all be converted to a halter style!
If you have any additional questions about style or fit please don't hesitate to contact us at (877) 728-9272.