Burmy does not evolve by held items. to get them to evolve you need to level them up to level 21.
Wormadam does not evolve, but, you must be refering to Mothim. To get mothim simply level up a male burmy to level 20.
Burmy evolves at level 20.
Burmy (no matter which cloak) will evolve into Mothim at level 25. The Burmy has to be male, or it will evolve into a Wormadam.
burmy evolves at level 22
Has to be a male burmy, evolves at level 20
If you want a Wormadam, level a female Burmy up to lvl 20 and evolve it. It's cloak depend on where you evolve it. If you prefer a Mothim, level up a male Burmy to level 20.
level 40
Level 30.
Level 32.
level 26 ^^
Level 16