How will we be dressed and act in Jannat?

yes, although at this moment that would only be speculation, since we don't know what paradise is like,.
rather we do know that it's not a place for testing and hardship, this generally speaking means rules that apply here in this life would not be applied there.

format_quote Originally Posted by Sari

I was just wondering that in Jannat will we still be covered Islamically, or as part of the rewards of Jannat, and because there will be no rules of Jannat, will we be able to dress any way we want.

there ARE other Ayats, but if you read Suratal Khaf weekly you will notice:

30:
Muhsin Khan: Verily! As for those who believe and do righteous deeds, certainly! We shall not suffer to be lost the reward of anyone who does his (righteous) deeds in the most perfect manner.
31:
Muhsin Khan: These! For them will be 'Adn (Eden) Paradise (everlasting Gardens); wherein rivers flow underneath them, therein they will be adorned with bracelets of gold, and they will wear green garments of fine and thick silk. They will recline therein on raised thrones. How good is the reward, and what an excellent Murtafaqa (dwelling, resting place, etc.)!

and a simple search of thrones:

from #37 Surah As Saafat

40:
Muhsin Khan: Save the chosen slaves of Allah (faithful, obedient, true believers of Islamic Monotheism).
41:
Muhsin Khan: For them there will be a known provision (in Paradise).
42:
Muhsin Khan: Fruits; and they shall be honoured,
43:
Muhsin Khan: In the Gardens of delight (Paradise),
44:
Muhsin Khan: Facing one another on thrones,
45:
Muhsin Khan: Round them will be passed a cup of pure wine;
46:
Muhsin Khan: White, delicious to the drinkers,
47:
Muhsin Khan: Neither they will have Ghoul (any kind of hurt, abdominal pain, headache, a sin, etc.) from that, nor will they suffer intoxication therefrom.
48:
Muhsin Khan: And with them will be chaste females, restraining their glances (desiring none except their husbands), with wide and beautiful eyes.
49:
Muhsin Khan: (Delicate and pure) as if they were (hidden) eggs (well) preserved.
50:
Muhsin Khan: Then they will turn to one another, mutually questioning.
51:
Muhsin Khan: A speaker of them will say: "Verily, I had a companion (in the world),
52:
Muhsin Khan: Who used to say: "Are you among those who believe (in resurrection after death).
53:
Muhsin Khan: "(That) when we die and become dust and bones, shall we indeed (be raised up) to receive reward or punishment (according to our deeds)?"
54:
Muhsin Khan: (The man) said: "Will you look down?"
55:
Muhsin Khan: So he looked down and saw him in the midst of the Fire.
56:
Muhsin Khan: He said: "By Allah! You have nearly ruined me.
57:
Muhsin Khan: "Had it not been for the Grace of my Lord, I would certainly have been among those brought forth (to Hell)."
58:
Muhsin Khan: (Allah informs about that true believer that he said): "Are we then not to die (any more)?
59:
Muhsin Khan: "Except our first death, and we shall not be punished? (after we have entered Paradise)."
60:
Muhsin Khan: Truly, this is the supreme success!

and from #52 Surat At Tur:
17:
Muhsin Khan: Verily, the Muttaqun (pious - see V.2:2) will be in Gardens (Paradise), and Delight.
18:
Muhsin Khan: Enjoying in that which their Lord has bestowed on them, and (the fact that) their Lord saved them from the torment of the blazing Fire.
19:
Muhsin Khan: "Eat and drink with happiness because of what you used to do."
20:
Muhsin Khan: They will recline (with ease) on thrones arranged in ranks. And We shall marry them to Houris (female, fair ones) with wide lovely eyes.
21:
Muhsin Khan: And those who believe and whose offspring follow them in Faith, to them shall We join their offspring, and We shall not decrease the reward of their deeds in anything. Every person is a pledge for that which he has earned.
22:
Muhsin Khan: And We shall provide them with fruit and meat, such as they desire.
23:
Muhsin Khan: There they shall pass from hand to hand a (wine) cup, free from any Laghw (dirty, false, evil vague talk between them), and free from sin (because it will be legal for them to drink).
24:
Muhsin Khan: And there will go round boy-servants of theirs, to serve them as if they were preserved pearls.
25:
Muhsin Khan: And some of them draw near to others, questioning.
26:
Muhsin Khan: Saying: "Aforetime, we were afraid with our families (from the punishment of Allah).
27:
Muhsin Khan: "But Allah has been gracious to us, and has saved us from the torment of the Fire.

and from #56 Surah Al Waqia:

8:
Muhsin Khan: So those on the Right Hand (i.e. those who will be given their Records in their right hands), Who will be those on the Right Hand? (As a respect for them, because they will enter Paradise).
9:
Muhsin Khan: And those on the Left Hand (i.e. those who will be given their Record in their left hands), Who will be those on the Left Hand? (As a disgrace for them, because they will enter Hell).
10:
Muhsin Khan: And those foremost [(in Islamic Faith of Monotheism and in performing righteous deeds) in the life of this world on the very first call for to embrace Islam,] will be foremost (in Paradise).
11:
Muhsin Khan: These will be those nearest to Allah.
12:
Muhsin Khan: In the Gardens of delight (Paradise).
13:
Muhsin Khan: A multitude of those (foremost) will be from the first generations (who embraced Islam).
14:
Muhsin Khan: And a few of those (foremost) will be from the later time (generations).
15:
Muhsin Khan: (They will be) on thrones woven with gold and precious stones,
16:
Muhsin Khan: Reclining thereon, face to face.
17:
Muhsin Khan: They will be served by immortal boys,
18:
Muhsin Khan: With cups, and jugs, and a glass from the flowing wine,
19:
Muhsin Khan: Wherefrom they will get neither any aching of the head, nor any intoxication.
20:
Muhsin Khan: And fruit; that they may choose.
21:
Muhsin Khan: And the flesh of fowls that they desire.
22:
Muhsin Khan: And (there will be) Houris (fair females) with wide, lovely eyes (as wives for the pious),
23:
Muhsin Khan: Like unto preserved pearls.
24:
Muhsin Khan: A reward for what they used to do.
25:
Muhsin Khan: No Laghw (dirty, false, evil vain talk) will they hear therein, nor any sinful speech (like backbiting, etc.).
26:
Muhsin Khan: But only the saying of: Salam!, Salam! (greetings with peace) !
27:
Muhsin Khan: And those on the Right Hand, Who will be those on the Right Hand?
28:
Muhsin Khan: (They will be) among thornless lote-trees,
29:
Muhsin Khan: Among Talh (banana-trees) with fruits piled one above another,
30:
Muhsin Khan: In shade long-extended,
31:
Muhsin Khan: By water flowing constantly,
32:
Muhsin Khan: And fruit in plenty,
33:
Muhsin Khan: Whose season is not limited, and their supply will not be cut off,
34:
Muhsin Khan: And on couches or thrones, raised high.
35:
Muhsin Khan: Verily, We have created them (maidens) of special creation.
36:
Muhsin Khan: And made them virgins.
37:
Muhsin Khan: Loving (their husbands only), equal in age.
38:
Muhsin Khan: For those on the Right Hand.
39:
Muhsin Khan: A multitude of those (on the Right Hand) will be from the first generation (who embraced Islam).
40:
Muhsin Khan: And a multitude of those (on the Right Hand) will be from the later times (generations).

that's a few examples, admittedly in translation.