Also on these boards
1930s Dress Pattern Vintage Simplicity 3298 One Piece Career Day Dress Lovely Unique Bodice Size 16. $36.00, via Etsy.
Vintage 1955 Simplicity 1092 Sewing Pattern Misses' and Women's One-Piece Dress With Detachable Neckline Trim and Collar Size 16 Bust 34 on Etsy, $20.00
Simplicity 6825 Wedding Dress with Detachable by ThePatternShopp, $20.00 I'm pretty sure this was my mother's pattern!
Simplicity 5238 Vintage Sewing pattern Dress This would be cool to make with multiple detachable collars for different looks.