This vintage longline from Sears is almost identical to the Playtex longline that I posted earlier here. I suspect that this bra was made by Playtex for Sears. The rubberized “spanette” fabric is the same as is used in many traditional Playtex 18-Hour bras. The two differences I could find between the bras is the more usual ring and slider strap adjuster on the Sears bra and the different lace and lining material used on the cups and front panels.
The 3 section lace cups are lined with a woven poly/cotton material. Non-stretch straps have front adjusters. Twelve hooks in the front. Sadly, this bra is very worn out and would not be practical to wear.