Why was wearing a white wedding dress considered permissible as it is a custom for Muslims, while wearing a wedding ring was considered forbidden as it is an imitation of disbelievers, even though both have become common customs?

It was not mentioned in Fatwa no. 107607 that wearing a wedding ring is forbidden due to imitating disbelievers. Rather, it is preferable for both men and women not to wear it on this occasion, as it is a potential cause for imitating the customs of disbelievers. It was advised not to wear it because it is a potential cause for imitation, and it becomes forbidden if wearing it is accompanied by corrupt beliefs.