I'm just maybe clarifying some things....
Starts at 6pm -- no indication on length. I assumed lasting until 10 or 11. ??
At the home of the bride's parents, residential area
hosted by both sets of parents
"The celebration of their marriage"
'Cocktail Buffet' --- I assumed this to be buffet dinner...not heavy food, not just appetizers, but a meal since starts at 6pm
Formal invite as in it is on card stock, but fairly basic.
I dont think I'm going for a LBD, probably a slight step less informal than that. Like, I think a simple/fairly plain LBD would be fairly appropropriate, but nothing more. I'm going for a nice black dress with some sparkly jewelry and nice black heels. Good? I hope. Sorry, just really want to avoid having to purchase anything, and I would need to purchase a LBD (everything I have is dated and shows too much of my new, post kids body