There is no doubt that sports bras are taking over the fashion world. We have worn sneakers as a high fashion for couple years now and the time has come to make comfortable undies the "It" item as well.
Yes, CK Underwear is taking over the Instagram and Yes, I went also quite mainstream and overstepped my budget for some Klein's knickers and bra. No regrets there! It is probably the most comfortable underwear I've ever worn. I have been gifted in the chest area and I hate all the wire bras since, they just irritate my skin so I have been wearing sport bras for quite awhile but Nike's polyester/elastane cannot beat 100% quality cotton.
Sometimes, going mainstream can be comfy as hell!