If I’m honest neither are black tie op, I’m sorry, if money is tight could you rent something?
the first dress is a casual summer maxi dress, I’d wear that out and about. The second jumpsuit does nothing for you, it’s also not remotely black tie either. Generally jersey materials are not black tie,
if it helps , this is an ai explanation of what black tie is,
Black tie for women is a highly formal evening dress code. The standard expectation is a floor-length evening gown made from luxurious fabrics like silk, velvet, chiffon, or satin. Modern interpretations also allow for elegant midi cocktail dresses, dressy evening trousers, or tailored jumpsuits.
Key Elements of Black Tie
The Dress: Floor-length gowns are the safest and most traditional choice. However, elegant midi or maxi-length dresses (below the knee) are generally accepted. Hemlines above the knee are usually too casual.
Alternatives: A sharply tailored, high-end tuxedo suit or a sophisticated, wide-leg jumpsuit in a rich fabric is a stylish and perfectly acceptable alternative.
Fabrics: The material is key to looking "black tie." Avoid everyday cottons or jerseys in favor of lace, sequins, crepe, or satin.
Shoes & Accessories: Pair your outfit with elegant evening heels or dressy flats. Complete the look with fine jewelry, a statement clutch, and—if the weather requires it—a formal evening shawl or faux-fur wrap.
The Unwritten Rules
Weddings: Avoid white, cream, or ivory.
When in doubt: It is always better to be slightly overdressed than underdressed