Bra strap holders/lingerie guards can help you keep straps or sleeves

How to Sew Lingerie Strap Guards, Bra hooks and Snaps

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How to Keep Bra Straps in Place: 4 Best Methods

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How to Keep Sleeves from Falling Off The Shoulder

How to Make and Install Strap Holders or Bra Keepers Tutorial - Easy DIY Sewing Project

LUCSIS Bra strap holders non slip elastic banding, bra strap clips for the back, cross back convertors (11A (White, Clear, Beige, Black)) at Women's Clothing store

Keep Straps Falling on Dress