All together and In birthday suit

All together adverb - Used of a group whose members acted or were acted upon collectively and when `all' and `together' can be separated by other words.

In birthday suit and all together are semantically related. In some cases you can use "In birthday suit" instead an adjective phrase "All together".

All together and in birthday suit are semantically related. Sometimes you can use "All together" instead an adjective phrase "In birthday suit".