Dress is generally informal in Israel. In summer, you will need lots of easy-care cottons and other lightweight fabrics. The sun can blaze during the day, but the dry climate makes it bearable. (Tel Aviv and Haifa, by contrast, situated on the Mediterranean Sea, are extremely humid.) Take care to protect yourself against the sun – a hat and sunglasses, sunblock, and a water bottle are essential constant companions. The heat eases in the late afternoon and in the evening you might find you need a light jacket or sweater, even at the height of summer.
In winter, warm indoor wear is as important as outdoor clothing. Jerusalem winters are generally short and outside temperatures often pleasant but tile-floored homes, while cool in summer, can be very cold when not heated. And with inflated heating costs, central heating (often operated uniformly through an apartment building, not on an individual basis) may be limited to the late afternoon and early evening hours. Note that schoolrooms, too, are often unheated. Indoors, you will want flannel shirts, sweaters, tracksuits, warm sleepwear and slippers. Outside, you will need a heavy sweater or light jacket on most winter days, as well as raingear and waterproof boots. An umbrella is never enough, as Jerusalem rainstorms are often accompanied by gusts of wind which most umbrellas are not made to withstand.
You can buy clothes of different styles in a wide range of prices at the city center and at the malls (Mamilla, Malha and Talpiyot).