Problem with repeating clothing

I made a shirt using the Roblox template and I’ve put the shirt on an R15 block rig.

The problem is that on the bottom of both of the upper arms, the pattern repeats itself and the only way I can get rid of it is if I erase the back of the arms.

https://imgur.com/KsMXysc

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Thank you

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super late here but its the way roblox “unwraps” the model into the clothing, the solution would be to simply just move the shirt sleeves a little more up
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