[Kalium]

With the advent of Indochino, Proper Suit, Black Lapel, Dragon Inside, and more it's possible to get the Hong Kong tailor experience without having to find one of those scheduled to stop near you. Indochino and Proper Suit have storefronts in SF.

[scrumper]

Ah true but part of the fun for OP will be having a smiling gentleman fondle his inside leg in an anonymous hotel suite. No app can reproduce that.

[Kalium]

For that, there's always Craigslist!

Slightly more seriously, the Indochino storefront has you covered on that front.