无拘无束 | wú jū wú shù | free and unconstrained (idiom) / unfettered / unbuttoned / without care or worries | |
疏放 | shū fàng | eccentric / self-indulgent / free and unconventional (written style) / unbuttoned | |
开襟 | kāi jīn | buttoned Chinese tunic / unbuttoned (to cool down) |