i see these two as being quite different.
nakedness for me applies more to our love partner and the family whereas nudity i see as being in a public space without clothes.
nakedness is shedding clothes and looking at yourself with a certain sense of acceptance. i will not go so far as to say with total acceptance, because that is pretty tough i think, well it's certainly tough for me. maybe for you it's easy. but even a strong sense of acceptance is healthy enough. i think we need to have a love for our bodies to be able to roll around on the bed with someone and feel comfortable in our skin. to look, to touch and feel good about the other looking and touching. nakedness to me is feeling free and unashamed to look at each other within the family - accepting a healthy dollop of reservations here for exceptions or certain age-groups.
working towards accepting our bodies 'as is' i think is crucial. and if for some reason we're not happy with being this way, we don't like what we see in the mirror then perhaps embracing and not denying or rejecting, the impetus that this unhappiness may bring to help us set out on the road of healthy changes.
as for nudity ... i believe certain changes, certain growth can only take place once we shed the armour of clothing. to me this is huge. clothing is something to hide behind, something to give us 'a look', the look that we might have cultivated for years. it keeps people out and keeps us from feeling as vulnerable as we ought to feel in order to make profound changes to our thinking. once the initial embarrassment is over i sense a deeper connection with those around me. shed the clothing and walk out with other people who are not clothed and there is nowhere to hide.
i've experienced such stupendous revelations when interacting with others in this way. to witness the rainbow of gender expression that is to be human (real life it is not as most forms would lead us to believe ... tick one or the other box :-); to see the human form 'warts and all' and to see power and beauty reflect in the faces of people who have survived cancer operations led me to look deeply within myself and understand some of my own weaknesses and negative preconceptions.
i've been humbled by the strength people have shown in their nudity.
reducing the anxiety to be seen without clothing also reduces tensions in ourselves that can manifest in different ways. of course we may not all have the opportunity to be nude in public, we can't take our clothes off and kinda walk out into the neighbourhood park, can we? but perhaps by looking around you might find a place, or group where this is possible. if a chance occurs for this, then take it. you also might find such an experience positive.