It’s a little unclear in this thumbnail, but if you click through to the large version at Kinky Delight, you can see that the women of this bridal party have chosen to label their panties, presumably to avoid any drunken confusion that might later be regretted:

drunk bridesmaids labeled on their panties

The two bridesmaids on the left are labeled “Bridesmaid”, the bride herself has sensibly gone with “Mrs. [illegible]“, and the woman on the right is wearing panties that say “Maid Of Honor”.