I bought three and all stretch out a bit even during the day while wearing them. Just have to tighten them up a couple of times during the day.
𧲠Wurkin Stiffs Plastic Magnetic Men's Accessories and Collar Stays for Stiff N Stay
8 Review
Stiffs Wurkin: Premium π Assorted Brass Collar for Polished Style
9 Review
π Ultimate Flexibility with Premium Extender Expandable Elastic America Men's Accessories
9 Review
40 Metal Collar Stays Box
9 Review