Rob245

Answer: Yoda isn't "better" than Sidious, they are at roughly the same power level. Sidious and Yoda fight to a stalemate. Yoda leaves because he does not believe he can kill Sidious. Yoda chooses to go into exile and regroup with Obi-Wan to develop a plan to be able to stop Sidious in the future.

BaconIsMyBFF

Answer: In-universe, it is the typical clothing of a Twi'lek female. Jedi are allowed to wear whatever clothing they want, though most choose the robes fitting the ascetic life of a Jedi.

LorgSkyegon

Answer: Several possibilities. There are cultural differences in how the different races dress that may supersede the traditional Jedi uniform. However, and more likely, movies often sexualize women characters by dressing them in skimpy, skin-bearing costumes, even when it is out-of-sync with how others are dressed.

raywest ★

Answer: Going along with LorgSkyegon's answer, the clothing is common for female Twi'leks. Many Jedi observe a few traditions, customs, etc. of the worlds they came from. Since they are guardians of peace across the galaxy, they need to respect all cultures. It can be helpful for a Jedi to acknowledge their background, especially if they ever need to deal with a situation involving their species/homeworld.