(Disclaimer, Star Trek: Starscout is a fanmade Star Trek X Equestria Girls was made by @JRShinkansenHorse)
I made three variations of Pipp Petals wearing any Starfleet Uniforms throughout TNG-Era of Star Trek.

1: Protostar Cadet Uniform (Marestream)
After the Mane 6 of G5 becoming the crew of the USS Marestream, a modified Protostar-Class and Cardenas-Class starship powered by a Hope Lantern Drive. As Pipp Petals discovers a stash into the locker room, she discovers her Protostar Uniforms to wear as a cadet of the Starship Marestream.

2: Starfleet Uniform 2260s
Pipp Petals went inside the empty space of Holodeck room until she’s going to query the simulation typing at “Galaxy-Class Starship” from the LCARS, the Holodeck simulation has generated as she walks through the corridor until she reacting her 2260’s Starfleet Uniform because her cadet suit was changed and Pipp Petals realized that Holodeck has auto-clothing from herself.

3: Deanna Troi Variant:
This is one of the Pipp Petals' favorite suit as she was a fangirl to Counselor Deanna Troi, after she takes a sonic shower as she walks out to generating fabrics as she requested from the clothing replicator to replicate Deanna Troi's bodysuit in TNG-Era.

And here are three Starfleet Uniform variants of Pipp Petals' favorite Starfleet Uniforms in Star Trek: Starscout