Step 1Cut crusts off bread and discard. Place 1 slice in bottom of 2 1/2-quart bowl. Place more slices around sides of bowl, keeping slices touching each other and touching slice on bottom. Cover sides of bowl completely. Don't squeeze or force the slices to fit perfectly. If you have lots of crevices, cut some slices to fill in cracks and open spots. When finished, bowl should be neatly covered with bread.
Step 2Combine berries and sugar in another bowl. Mash berries some so they release juice. Lightly stir to distribute sugar. Taste for sweetness; add more sugar if needed. Let stand 45 minutes. Place berries in bowl on top of bread and cover with more bread slices. Cover with plastic wrap and refrigerate overnight.
Step 3To serve, place serving platter upside down on top of bowl. Holding platter in place, flip platter right-side up and unmold. (Can be refrigerated 1 week.)