Both of these fashions were made by La Boutique and I purchased them on the secondary market. The first one is Jackie's Inaugural ballgown and it came in a presentation package that made it clear what it was. The second one, the yellow fashion, had no packaging but it just screamed Jackie Kennedy to me. Some diligent googling and I found the inspiration fashion by Oleg Cassini that Jackie wore during a visit to Mexico in 1962.
Some archived pics of Jackie in the inaugural gown:
Without the cape:
LB's replica fashion on In the Pink silkstone Barbie. First, showing the packaging.
Now, the actual fashion with the cape:
Without the cape:
Without the sheer over-blouse and to show the purse. LB made the shoes & jewelry as well:
Now, the Mexico City day suit inspiration pics:
The LB suit did include a yellow straw hat but I couldn't get it to look right on ITP's poofy hair.
Thanks to whoever's idea this theme was since it inspired me to dig these fashions out and put them on a doll!