Weird grey line glitch on roblox clothing preview - Art Design

Why is this happening? In Roblox, I make clothing. Is there anyone that can tell me why grey lines are appearing? You can have a look but I'm beyond positive it's the

Some of my clothes doesn't appear ingame, someone knows why? : r/bloxfruits

miss when the wardrobe looked like this : r/roblox

My first attempt at doing glitch art! - Creations Feedback - Developer Forum

Pink Roblox Studio Logo Essential T-Shirt for Sale by MaryAnd1

Roblox How to make your avatar big with the layered clothing glitch (patched)

Men's T-shirt Design Merch Game Print Roblox - Idolstore - Merchandise And Collectibles

Issues with clothing templates - Art Design Support - Developer Forum

Roblox's GLITCHED SHIRT puts THIS in game *REAL*

ROBLOX SQUISHED HEAD AVATAR GLITCH!?