Easy Trauma and Ghost suit:
To easily obtain the Trauma and Ghost suit for free:

Trauma suit - Simply let Chibi Robo run out of energy. When you come to in the Chibi House, you will be wearing the trauma suit.

Ghost suit - Exit the Chibi House and equip the Trauma suit. Pose with "Z", then wait a few seconds and you will wake up in the Chibi House with the ghost suit on.

All Suits and Chibi-Gear:
These are how to get all suits and Chibi-Gear

Chibi-Blaster Buy in shop for 1110 Moolah

Chibi-Radar Buy in shop for 1120 Moolah after giving Mrs. Sanderson some clothes for the pajamas.

Toothbrush Under the couch i8n the Living Room

Mug On the kitchen counter during the day

Spoon Use Ladder Utilibot in kitchen to get to the shelf

Squirter Under Jenny's TV in Jenny's Room

Drake Redcrest Suit Talk to Drake Redcrest in the Living Room at night

Trauma Suit Die once

Ghost Suit Use Trauma Suit's pose

Tao Suit Complete the first four Free Ranger trainings and start the fifth.

Frog Suit Squirt water on the frog in the backyard.

Pajamas Give Mrs. Sanderson old clothes after she stays in her room.

Super-Chibi-Robo suit Activate Giga-Robo

Unlockable Stickers:
Utilibot Sticker - Build all the the Utilibots