Bird observation in their natural habitat is first and foremost an extra reason to be in the open air.
Also, the beautiful birdwatching can be practiced by everyone and almost everywhere. It is possible to make interesting observations in the gardens under the house, in the nearby countryside, but also in the heart of the city.
As for what to wear, enough comfortable and not too colourful cloths, good binoculars, a field manual for species recognition and above lot of patience.