When the toga is donned the wearer can choose one of its mystical effects, to change the active effect you need only think it (And tell the DM of course)

there is no situation in which you may not swap out effects (However you may get your bones instantly shattered if you turn from lobster to regular form in a space too small for you)

• Gain double advantage to animal handling when in reference to any crustacean.
• Can speak an (albeit rudimentary) language to any crustacean.
• Transform into a lobster, this lobster is about 5 inches tall and 9 inches long, it has one third the maximum health of the players regular maximum health, it can only hold or use items smaller than itself, it has advantage to any stealth check and disadvantage to any intelligence or dexterity check, it has a few abilities that are special to it:           
  • Pince: Snap your pincer claw at a target dealing 1d4 -1 damage slashing.
  • Crush: Grasp your crusher claw at a target dealing 1d4 damage bludgeoning with advantage, this requires you to clasp your claw onto the enemy for around three minutes (turns)       -- not including the initial hit and you will become vulnerable to any damage for those turns. this deals an additional 2 slashing damage for every turn you can remain clasping.
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This crude armor consists of thick furs and pelts.