A costume. Which costume would depend on which part.
Shakespeare wore clothes that wear fashionable
See the related links.
I'm sure he had more than one pair of pants.
The style of clothing is Renaissance Clothing
I think it is Othello?? 1604
kinda In that era it was normal for English men to wear their hair about shoulder length.
There is no historical evidence that William Shakespeare specifically wore a red and green belt. However, colorful clothing during the Elizabethan era often signified status and wealth. It's possible that if he did wear such a belt, it would have been a reflection of fashion trends of his time, which included vibrant colors and elaborate attire. Ultimately, details about Shakespeare's personal wardrobe remain largely speculative.
Marcus Brutus would wear the standard Roman tunic and toga, just like all the other men of his time. If you are referring to the character Marcus Brutus in Shakespeare's play, he would wear whatever the wardrobe department gave him.
It's hard to draw pictures in this space but I can point you to some pictures in the related links which might help.
Yes, but that doesn't do you much good. You want pictures that you can see, for which I recommend Google images. Try looking for the Droushout portrait of Shakespeare which shows the clothing Shakespeare did wear.
Check out the two guaranteed images of shakespeare: the Droushout portrait and his memorial in Stratford church. You could also have a look at the Chandos Portrait. All three are shown in the Wikipedia article in related links.
Purple. You had to be practically royal to be allowed to wear it.