If you are looking for tips on what to wear in Hyderabad, look no further. The first thing to think about is the climate: Hyderabad is a fairly warm place most of the time, only dipping into 20°C/68°F and below during December. At other times of the year, however, it stays around the 40°C/104°F mark. Some months see the climate approaching semi-arid descriptions, but come the monsoon months—specifically, July and August—you are going to be getting some high heat paired with high humidity and regular rainfall… which basically equates to a need for clothes with light fabrics and umbrellas or raincoats.
At other times of the year, you can simply get by with some nicely breezy cotton clothes. It is best to shoot for the simpler, more casual style overall, as—even though it has become pretty modern with its fashion sense—the city is still more or less a conservative one, in keeping with Indian culture. You are not liable to see any of the bright colours and unorthodox cuts of, say, Tokyo here.
This means that travellers should pack for heat but prepare a light coat or two in case they are coming around the “-ber” months of the year. Western clothing is perfectly acceptable—most of the youth of Hyderabad prefer to wear it, as a matter of fact—but should be chosen with an eye to simplicity, as mentioned earlier. Slightly more conservatism may be advised too, especially of the women, as the local culture is not yet as accepting of more liberal “Western” modes of dress for females. Yes, you can wear a skirt, but it is not advisable to wear miniskirts. Sleeveless clothing is indeed permitted, but should stay away from being overly revealing (like strapless tops, for instance). Braless is definitely not okay. Plain t-shirts, trousers, and knee-length shorts are de rigueur.
Mind you, this is not just a matter of observing the local customs, if you are hesitant to “knuckle under to old-fashioned modes of dressing women”. There is also the matter of your safety. Hyderabad is a thickly populated metropolis, and drawing attention to yourself with overly revealing clothes or fashions would hardly be wise for any traveller.
This does not mean that you should avoid packing one or two nice ensembles, of course. There may well be some restaurants or other establishments you shall be interested in going to that require patrons to come in nice dress, although they rarely mandate formal clothing—semi-formal is more common, so there is not really a need to bring a tux for the men. Other than that little provision, knowing what to wear in Hyderabad is a simple matter of finding clothes in which you can walk around comfortably and without experiencing too much sweating in a warm, densely populated area. Of course, you should not forget to pack a sensible pair of shoes: boots and stilettos are not exactly ideal for walking around the city.