Swimsuit construction leading up to elastic insertion - shelf bra and ties, foam cups, and then suit seams.
Shelf Bra Tutorial -- Ipswich Swimsuit
Suitably Attired: Boosting Confidence with a Swimsuit that Fits
Wardrobe Essentials - Swimwear 6/13/22 - PatternReview.com Blog
Bra Friendly Amélie Sewalong - Part 3 - Attaching the Gussets
Swimsuits – SewSophieLynn
Cottesloe Sewalong How to Sew Shelf Bra & Ties (View A)
Cottesloe Swimsuit & Mesh Cover-Up - Megan Makes
How to Add a Shelf Bra to a Tank Sewing Pattern
Cottesloe Sewalong, How to Sew Shelf Bra & Ties (View A)
30 One-Piece Patterns for Swimwear Sewing – Tailor Made Blog
Megan Nielsen Cottesloe Swimsuit & Bikini Set Paper Pattern