The bulk update request #2859 is pending approval.
create alias open-back_dress (0) -> backless_dress (1414)
create alias open_back_dress (51) -> backless_dress (1414)
create implication backless_dress (1414) -> backless_clothing (2128)
create implication backless_dress (1414) -> dress (97164)
create alias open-back_leotard (198) -> backless_leotard (260)
create implication backless_leotard (260) -> backless_clothing (2128)
create implication backless_leotard (260) -> leotard (18256)
create alias open-back_swimsuit (505) -> backless_swimsuit (670)
create implication backless_swimsuit (670) -> backless_clothing (2128)
create implication backless_swimsuit (670) -> one-piece_swimsuit (21748)
create alias open-back_sweater (5) -> backless_sweater (5)
create alias open_back_sweater (15) -> backless_sweater (5)
create implication backless_sweater (5) -> backless_topwear (34)
create implication backless_sweater (5) -> backless_clothing (2128)
create implication backless_sweater (5) -> sweater (44055)
create alias open-back_shirt (0) -> backless_shirt (9)
create implication backless_shirt (9) -> backless_topwear (34)
create implication backless_shirt (9) -> backless_clothing (2128)
create implication backless_shirt (9) -> shirt (370388)
create alias open-back_topwear (3) -> backless_topwear (34)
create implication backless_topwear (34) -> backless_clothing (2128)
create implication backless_topwear (34) -> topwear (618021)
create alias open-back_clothing (10) -> backless_clothing (2128)
create implication backless_clothing (2128) -> clothing (2307334)
Reason: "backless" is used for 14 tags while "open-back" is only used for 6 tags as of now. "Backless" seems to be the preferred term: Wikipedia