New baseball stadiums planned for Chicago and Baltimore will look more like parks built at the turn of the last century than the 1980s. The reminiscent design of both stadiums, Chicago's Comiskey II and Baltimore's Camden Yards, will capitalize on the nostalgia that seems part of baseball's recent record popularity. In Chicago, the White Sox will open their 1991 season in Comiskey II, a near-clone of the aging original. The architects (Rick deFlon and Joe Spear of Kansas City's Hellmuth, Obata, & Kassabaum) have designed a stadium of identical dimensions, but they've modernized the traffic flow and designed swanker locker rooms. There will be a smaller overhanging roof to eliminate the need for the sightrestricting supporting piers. Otherwise, the stadium remains essentially the same, and