Yes, but only when the "bitte" can be used in the answer. This is the case for offerings, e.g.
Möchtest du noch ein Glas Wein?
Do you want another glass of wine?
Kann ich Ihnen etwas zu essen anbieten?
Can I offer you (formal) something to eat?
For questions like Do you like the red dress? You cannot answer yes, please so the bitte would make no sense and a simple Ja may be a bit dry but not informal. I think it is similar in English.
I think it is quite similar in English. If someone asks you if you like his/her new dress you would probably answer Yes, it suits you well, Yes, where did you get it? or Yes, but..., because a simple yes, although a valid answer, wouldn't suffice to keep the conversation going. And it doesn't really matter if the you is formal or not.