It depends on your definition of fast fashion. You can use https://goodonyou.eco/ to suss out how ‘ethical’, ‘fair trade’ and ‘sustainable’ brands actually are.

Some of my favourite legit Australian ethical clothing stores are VegeThreads and Woolerina. Both also make men’s stuff.

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What are you looking for? Casual or a suit? Work or fun? New or second hand? If you're not against a trip out of town Tawa has an outlet centre where you can get the normal brands for cheap. But it can be a bit disappointing if you're after a very fashion selection. Second hand out of town - Savemart in east Porirua is fantastic. Otherwise in town - Hallensteins if you don't mind very fashion but average quality clothes, cheap though and will last OK if you look after your clothes. Does both suits and casual. Farmers on Lambton Quay will also do some suits and stuff but the quality isn't fantastic - think polyester over cotton or wool. Barkers (NZ owned) for fine quality but more expensive than Hallensteins. Does both suits and casual, and does decent business casual too (blazers, dress pants, shirts etc). Country Road (overseas owned) is similar. Places like Good as Gold, Amazon, etc do casual wear but very fashion and more $. AS colour will do casual wear but more basics (think decent t-shirts, hoodies etc). I'm pretty sure there's a Rembrandt in town? They have pretty good suits but a little more $$. All wool though (so nicer to wear) and I'm pretty sure it's made in NZ (it used to be 10ish years ago but it may have changed). Jeans shops for jeans and shirts - Hurricane on Willis Street, or Just Jeans on Lambton Quay, or General Pants on Willis. Levis is on Willis/Featherston street. If you're baller and want some decent stuff, go to Working Style on Woodward Street, Rodd and Gunn on Willis Street, R.M. Williams on Willis Street, World on Victoria Street (verrrryyyy fashion tho), and David Jones on Lambton Quay. There's a suit place on Lambton Quay (near Mason Lane I think?) Which is also a little $$. If you are keen on second hand - Hunters and collectors get some amazing vintage designer, Recycle Boutique often have some amazing stuff, Spacesuit and Thrift are all pretty good too (all on Cuba or just off Cuba). Sallies on Taranaki and Vivian (I think?) Are OK too. Lots of stores will be in winter sales, so if you do a bit of online searching you can find some decent price cuts, especially in the wake of Covid - retail stores are trying to attract customers at the moment so prices are fairly decent. More on reddit.com

It depends on your style and budget. For affordable but trendy clothes, I'd say Cortefiel, Corte Ingés, Zara, Pull&Bear...

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Uniqlo does good standard stuff - nothing fancy but fits the bill. Also Hollister for some basics like t-shirts etc More on reddit.com