What should i wear on my trip to Paris, France and London in June?

Hi everyone! Thanks for taking the time to read this. So I am a teenage girl, and I love fashion. I usually shop at stores like Forever21, Marshal’s, and TJ Maxx because i like that their clothes are cute, and inexpensive. I am taking a trip this summer, in June, to Paris, France, & London and I have no idea what to wear…
-What should I wear on my 16 hour plane trip if I want to stay away from sweatpants, hoodies, flip flops, and tennis shoes, while still being comfortable?
– What types of outfits should I wear while I am there if I want to be cute, comfortable, and fit in? (it will be hot probably… and i need comfortable shoes)
PICTURES & LINKS PLEASE

Here is our itenterary for the 10 days of this helps:
-Day 1 Start Tour
-Day 2 Bonjour Paris
*Paris City Walk
*Ile de la Cité
*Notre Dame Cathedral
*Ile St. Louis
*Latin Quarter visit
*Dinner in Latin Quarter

-Day 3 Paris Landmarks
*Arc de Triomphe
*Champs-Élysées
*Eiffel Tower
*Champ de Mars
*École Militaire
*Les Invalides
*Conciergerie
*Tuileries
*Place Vendôme
*Opera House

-Day 4 Royal Paris
*Louvre visit
*Fragonard’s Perfume Museum visit
*Seine River Sightseeing Cruise
*Couscous Dinner

-Day 5

-Day 6 The Art of Paris
*Musée d’Orsay visit
*Eiffel Tower ascent
*Dinner at a crêperie

-Day 7
*Farewell dinner in Montmartre

-Day 8 Start Extension to London
*Eurostar Chunnel crossing
*London City Walk
*Thames River
*Trafalgar Square
*National Gallery Visit
*Piccadilly Circus
*Covent Garden
*Leicester Square
*Soho
*Fish & chips dinner

-Day 9 London Landmarks
*London Guided Sightseeing Tour
*Buckingham Palace, Big Ben, Houses of Parliament, Westminster Abbey, Tower Bridge, Hyde Park, *St. Paul’s Cathedral

-Day 10 End Tour

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