Can You Get Double Proficiency 5E?

"You gain expertise with that skill, which means your proficiency bonus is doubled for any ability check you make with it." Twice Proficiency allows you to apply double proficiency to a skill or tool under a specific situation, even if you are not already proficient in that skill or tool.

Can you double up on proficiency 5e?

The bonuses do not stack. So according to the basic rules, if a background grants you a redundant proficiency, just pick another that's appropriate for your character.

Can proficiency stack 5e?

No, if you gain proficiency in a skill or tool from more than one source you are free to select ANY other skill or tool of your choice, but must be of the same type (ie if you gained proficiency in a skill select another skill, if it was a tool then select another tool, but can not select a skill in place of a tool or ...