Well, my favorite online purveyors are listed below, but if you have a conception of what you might want (like, say a red v-neck sweater or something) you can go to shopstyle.com and put it in the search box and it will find what you’re looking for via hundreds of online retail outfits. You can narrow selections down by price, size, brand etc. etc. It’s very helpful.
I’m not all that conservative like you, so I’ll do my best, but when I think conservative, I think:
lands end canvas (I forget the exact address–google it. this is Land’s End’s newest, younger stuff and it’s reminiscent of J.Crew before all J.Crew shirts started going through the funny lace and button machines 🙂
ll bean signature (similar to Lands’ End Canvas–a new younger outfit, but still very classic tailoring)
Shabby Apple is also a fun site that can suggest items based on your body type, but it’s a smaller outfit so things like sizing and returns might be less streamlined. The styling has a bit of a retro bent to it.
If you are small (like bitty Asian small), yesstyle.com is a…Korean company, I think (but I’m not completely sure) company that sources from all over Asia and has tons and tons and tons of inexpensive merchandise (shipping isn’t that bad either)–from trendy to classic. But be forewarned: measure, measure, measure before you purchase anything because when they say the waist is 18″ they are not kidding! (although I’m NOT teeny tiny and I still have found some things via yesstyle)
And I’m also a person for the “usual suspects,” so anthropologie, urbanoutfitters, asos (a UK company that’s somewhere inbetween Topshop & F21 pricewise, but has a lot of stuff, so don’t get too turned off thinking it’s too “young”), victoria’s secret, department stores, BR & Gap & Old Navy, etc.