I think you've been misinformed there. Greeks wear jeans just as much as anywhere else. Normal rules apply - dress up for smart restaurants & churches etc, I'd say. Also, it gets awfully hot to wear jeans in Greece!
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Versatile, Light Weight and Neutral ClothingOpt for lightweight, breathable fabrics such as linen, cotton, and silk. Pack mix-and-match pieces like neutral-colored shorts, skirts, and trousers that can be paired with different tops. Don't forget to include a few dresses for evenings out.
Don't wear hot pants or crop tops if you're planning on visiting any churches or monasteries. Some things are better left to the imagination. If you must wear hot pants, save them for a trip to the beach. And stay away from high heels, especially when visiting our slippery, sensitive marble ruins.
The dress code in the Greek islands is generally casual and relaxed, although stylish. During the day, beachwear, shorts, T-shirts, and summer dresses are common. Evening attire can be a bit more elegant, with men wearing trousers and shirts and women donning summer dresses or similar.
Make sure to bring a light sweater or jacket to keep warm on the patio of the taverna as you enjoy your spanakopita. A packable rain jacket can also come in handy if there's a big downpour. If you like to wear shorts, throw in a comfortable pair along with one or two more warm-weather tops.
Essential topsA few lightweight blouses and tank tops are a must for a trip to Greece. Wardrobe staples like this cargo shirt from Zara and linen button-down from Everlane are versatile and can be easily dressed up or down.
For shoes, sandals with an ankle strap and a sturdy sole are perfect. Heels are almost impossible to wear on the extremely hilly cobblestone streets. If you must bring heels, choose a pair of comfy wedges so you get a little more stability.
The biggest thing is to note is simply this: don't flush toilet paper down the loo. You will find there are bins to the side of the toilet where you can dispose of your tissue instead. The bins tend to have lids and foot pedals and are emptied at least once daily, so it's not as gruesome as it sounds.
Opt for lightweight, breathable fabrics such as linen, cotton, and silk. Pack mix-and-match pieces like neutral-colored shorts, skirts, and trousers that can be paired with different tops. Don't forget to include a few dresses for evenings out.
Clothing for both women and men consisted of two main garments—a tunic (either a peplos or chiton) and a cloak (himation). The peplos was simply a large rectangle of heavy fabric, usually wool, folded over along the upper edge so that the overfold (apoptygma) would reach to the waist.
July and August are the hottest. The best time to visit is late spring (May) and fall (Sept-Oct). It's pleasant, with comfortable weather, no rain, and smaller crowds (except during holiday weekends). Winter (late Oct through mid-March) is colder, with some rainfall.